Librarian in the context of Information professional

In conservation, library and archival science, preservation is a set of preventive conservation activities aimed at prolonging the life of a record, book, or object while making as few changes as possible. Preservation activities vary widely and may include monitoring the condition of items, maintaining the temperature and humidity in collection storage areas, writing a plan in case of emergencies, digitizing items, writing relevant metadata, and increasing accessibility. Preservation, in this definition, is practiced in a library or an archive by a conservator, librarian, archivist, or other professional when they perceive a collection or record is in need of maintenance.

Preservation should be distinguished from interventive conservation and restoration, which refers to the treatment and repair of individual items to slow the process of decay, or restore them to a usable state. "Preventive conservation" is used interchangeably with "preservation".

A library is a collection of books, and possibly other materials and media, that is accessible for use by its members and members of allied institutions. Libraries provide physical (hard copies) or digital (soft copies) materials, and may be a physical location, a virtual space, or both. A library's collection normally includes printed materials which can be borrowed, and usually also includes a reference section of publications which may only be utilized inside the premises. Resources such as commercial releases of films, television programmes, other video recordings, radio, music and audio recordings may be available in many formats. These include DVDs, Blu-rays, CDs, cassettes, or other applicable formats such as microform. They may also provide access to information, music or other content held on bibliographic databases. In addition, some libraries offer creation stations for makers which offer access to a 3D printing station with a 3D scanner.

Libraries can vary widely in size and may be organised and maintained by a public body such as a government, an institution (such as a school or museum), a corporation, or a private individual. In addition to providing materials, libraries also provide the services of librarians who are trained experts in finding, selecting, circulating and organising information while interpreting information needs and navigating and analysing large amounts of information with a variety of resources. The area of study is known as library and information science or studies.

Zenodotus (Ancient Greek: Ζηνόδοτος) was a Greek grammarian, literary critic, Homeric scholar, and the first librarian of the Library of Alexandria. A native of Ephesus and a pupil of Philitas of Cos, he lived during the reigns of the first two Ptolemies, and was at the height of his reputation about 280 BC.
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Callimachus (/kəˈlɪməkəs/; Ancient Greek: Καλλίμαχος, romanized: Kallimachos; c. 310 – c. 240 BC) was an ancient Greek poet, scholar, and librarian who was active in Alexandria during the 3rd century BC. A representative of Ancient Greek literature of the Hellenistic period, he wrote over 800 literary works, most of which do not survive, in a wide variety of genres. He espoused an aesthetic philosophy, known as Callimacheanism, which exerted a strong influence on the poets of the Roman Empire and, through them, on all subsequent Western literature.

Born into a prominent family in the Greek city of Cyrene in modern-day Libya, he was educated in Alexandria, the capital of the Ptolemaic kings of Egypt. After working as a schoolteacher in the city, he came under the patronage of King Ptolemy II Philadelphus and was employed at the Library of Alexandria where he compiled the Pinakes, a comprehensive catalogue of all Greek literature. He is believed to have lived into the reign of Ptolemy III Euergetes.

Aristophanes of Byzantium (Ancient Greek: Ἀριστοφάνης ὁ Βυζάντιος Aristophánēs ho Buzántios; Byzantium c. 257 BC – Alexandria c. 185–180 BC) was a Hellenistic Greek scholar, critic and grammarian, particularly renowned for his work in Homeric scholarship, but also for work on other classical authors such as Pindar and Hesiod. He soon moved to Alexandria and studied under Zenodotus, Callimachus, and Dionysius Iambus. He succeeded Eratosthenes as head librarian of the Library of Alexandria at the age of sixty. His students included Callistratus, Aristarchus of Samothrace, and perhaps Agallis. He was succeeded by Apollonius "The Classifier" (not to be confused with Apollonius of Rhodes, a previous head librarian of Alexandria). Aristophanes' pupil, Aristarchus of Samothrace, would be the sixth head librarian at the Library of Alexandria.

Aristarchus of Samothrace (Ancient Greek: Ἀρίσταρχος ὁ Σαμόθραξ, romanized: Aristarchos o Samothrax; c. 220 – c. 143 BC) was an ancient Greek grammarian, noted as the most influential of all scholars of Homeric poetry. He was the head librarian of the Library of Alexandria and seems to have succeeded his teacher Aristophanes of Byzantium in that role.

A public library is a library, most often a lending library, that is accessible by the general public and is usually funded from public sources, such as taxes. It is operated by librarians and library paraprofessionals, who are also civil servants.

There are five fundamental characteristics shared by public libraries:

A public library is a library that is accessible by the general public and is generally funded from public sources, such as taxes. It is operated by librarians and library paraprofessionals, who are also civil servants.

A union catalog is a combined library catalog describing the collections of a number of libraries. Union catalogs have been created in a range of media, including book format, microform, cards and more recently, networked electronic databases. Print union catalogs are typically arranged by title, author or subject (often employing a controlled vocabulary); electronic versions typically support keyword and Boolean queries. Union catalogs are useful to librarians, as they assist in locating and requesting materials from other libraries through interlibrary loan service. They also allow researchers to search through collections to which they would not otherwise have access, such as manuscript collections.

The largest union catalog ever printed is the American National Union Catalog Pre-1956 Imprints (NUC), completed in 1981. This achievement has since been superseded by the creation of union catalogs in the form of electronic databases, of which the largest is OCLC's WorldCat. Other examples include K10plus in Germany, Library Hub Discover (formerly COPAC) provided by Research Libraries UK and AMICUS, provided by Library and Archives Canada.

Jorge Francisco Isidoro Luis Borges (/ˈbɔːrhɛs/ BOR-hess; Spanish: [ˈxoɾxe ˈlwis ˈboɾxes] ; 24 August 1899 – 14 June 1986) was an Argentine short-story writer, essayist, poet and translator regarded as a key figure in Spanish-language and international literature. His best-known works, Ficciones (transl. Fictions) and El Aleph (transl. The Aleph), published in the 1940s, are collections of short stories exploring motifs such as dreams, labyrinths, chance, infinity, archives, mirrors, fictional writers, and mythology. Borges's works have contributed to philosophical literature and the fantasy genre, and have had a major influence on the magical realist movement in 20th century Latin American literature.

Born in Buenos Aires, Borges later moved with his family to Switzerland in 1914, where he studied at the Collège de Genève. The family travelled widely in Europe, including Spain. On his return to Argentina in 1921, Borges began publishing his poems and essays in surrealist literary journals. He also worked as a librarian and public lecturer. In 1955, he was appointed director of the National Public Library and professor of English Literature at the University of Buenos Aires. He became completely blind by the age of 55. Scholars have suggested that his progressive blindness helped him to create innovative literary symbols through imagination. By the 1960s, his work was translated and published widely in the United States and Europe. Borges himself was fluent in several languages.

François Émile Maupas (2 July 1842 in Vaudry – 18 October 1916 in Algiers) was a French librarian, protozoologist, cytologist, and botanist. Maupas contributed to ideas on the life cycle and reproduction of the ciliates. He founded the idea, known as the Maupasian life cycle, that some protists had a definite death following sexual reproduction, contrary to contemporary ideas on protists being immortal. He also identified the existence of mating types in ciliates. He developed culture techniques for a number of organisms and described the nematode Caenorhabditis elegans, which has since become a widely used model organism in biological studies.

Paulus Merula, or Paul van Merle (Dordrecht, 19 August 1558 - Rostock, 20 July 1607) was a Dutch jurist, classicist, historian, geographer and librarian.

In 1592 he was appointed professor of history at Leiden University, and was elevated to full professor in 1593. From 1597 until his death he was librarian to Leiden University Library, and in 1603 he was appointed rector magnificus of the university. He was friends with Janus Dousa and Daniël Heinsius, and was a Leiden contemporary of the humanist Joseph Justus Scaliger.

Melville Louis Kossuth "Melvil" Dewey (December 10, 1851 – December 26, 1931) was an American librarian and educator who invented the Dewey Decimal system of library classification. He was a founder of the Lake Placid Club, a chief librarian at Columbia College, founder of what would later become the Columbia University School of Library Service, and a founding member of the American Library Association. Although Dewey's contributions to the modern library are widely recognized, his legacy is marred by his sexual harassment of female colleagues, as well as his racism and antisemitism.

Ebbo, Ebo or Epo (c. 775 – 20 March 851) was the Archbishop of Rheims from 816 until 835 and again from 840 to 841. He was born a German serf on the royal demesne of Charlemagne. He was educated at his court and became the librarian and councillor of Louis the Pious, king of Aquitaine, son of Charlemagne. When Louis became emperor, he appointed Ebbo to the see of Rheims, then vacant after the death of Wulfaire.

He was an important figure in the spread of Christianity in the north of Europe. At the insistence of Louis, in 822, he went to Rome and asked Pope Pascal I to become the papal legate to the North. He was licensed to preach to the Danes and he and Halitgar, bishop of Cambrai, and Willerich, bishop of Bremen, went there in 823. He made short subsequent trips, but all with little success. Ansgar was more successful a few years later.

Theodore Nicholas Gill (March 21, 1837 – September 25, 1914) was an American ichthyologist, mammalogist, malacologist, and librarian.