Affidavit in the context of "Perjury"

A plaintiff (Π in legal shorthand) is the party who initiates a lawsuit (also known as an action) before a court. By doing so, the plaintiff seeks a legal remedy. If this search is successful, the court will issue judgment in favor of the plaintiff and make the appropriate court order (e.g., an order for damages). Plaintiff is the term used in civil cases in most English-speaking jurisdictions, the notable exceptions being England and Wales, where a plaintiff has, since the introduction of the Civil Procedure Rules in 1999, been known as a "claimant" and Scotland, where the party has always been known as the "pursuer". In criminal cases, the prosecutor brings the case against the defendant, but the key complaining party is often called the "complainant".

In some jurisdictions, a lawsuit is commenced by filing a summons, claim form or a complaint. These documents are known as pleadings, that set forth the alleged wrongs committed by the defendant or defendants with a demand for relief. In other jurisdictions, the action is commenced by service of legal process by delivery of these documents on the defendant by a process server; they are only filed with the court subsequently with an affidavit from the process server that they had been given to the defendant according to the rules of civil procedure.

A bulk sale, sometimes called a bulk transfer, is when a business sells all or nearly all of its inventory to a single buyer and such a sale is not part of the ordinary course of business. This type of action is often used in an attempt to dodge creditors who intend to seize such business's inventory; in order to protect the purchaser from claims made by creditors of the seller, the seller must usually complete an affidavit outlining its secured and unsecured creditors, which must usually be filed with a government department, such as a court office. Such procedures are outlined in the bulk sales act of most jurisdictions. If the buyer does not complete the registration process for a bulk sale, creditors of the seller may obtain a declaration that the sale was invalid against the creditors and the creditors may take possession of the goods or obtain judgment for any proceeds the buyer received from a subsequent sale.

A notary public (a.k.a. notary or public notary; pl. notaries public) of the common law is a public officer constituted by law to serve the public in non-contentious matters usually concerned with general financial transactions, estates, deeds, powers-of-attorney, and foreign and international business. A notary's main functions are to validate the signature of a person (for purposes of signing a document); administer oaths and affirmations; take affidavits and statutory declarations, including from witnesses; authenticate the execution of certain classes of documents; take acknowledgments (e.g., of deeds and other conveyances); provide notice of foreign drafts; provide exemplifications and notarial copies; and, to perform certain other official acts depending on the jurisdiction. Such transactions are known as notarial acts, or more commonly, notarizations. The term notary public only refers to common-law notaries and should not be confused with civil-law notaries.

With the exceptions of Louisiana, Puerto Rico, Quebec (whose private law is based on civil law), and British Columbia (whose notarial tradition stems from scrivener notary practice), a notary public in the rest of the United States and most of Canada has powers that are far more limited than those of civil-law or other common-law notaries, both of whom are qualified lawyers admitted to the bar: such notaries may be referred to as notaries-at-law or lawyer notaries. Therefore, at common law, notarial service is distinctly different from the practice of law, and giving legal advice and preparing legal instruments is forbidden to lay notaries such as those appointed throughout most of the United States. Despite these distinctions, lawyers in the United States may apply to become notaries, and this class of notary is allowed to provide legal advice, such as determining the type of act required (affidavit, acknowledgment, etc.).

A statutory declaration is a legal document defined under the law of certain Commonwealth nations and in the United States. It is similar to a statement made under oath, but it is not sworn.

Statutory declarations are commonly used to allow a person to declare something to be true for the purposes of satisfying some legal requirement or regulation when no other evidence is available. They are thus similar to affidavits, which, however, are made on oath.