Music streaming in the context of "UK Singles Chart"

The Billboard 200 is a record chart ranking the 200 most popular music albums and EPs in the United States. It is published weekly by Billboard magazine to convey the popularity of an artist or groups of artists. Sometimes, a recording act is remembered for its "number ones" that outperformed all other albums during at least one week. The chart grew from a weekly top 10 list in 1956 to become a top 200 list in May 1967, acquiring its existing name in March 1992. Its previous names include the Billboard Top LPs (1961–1972), Billboard Top LPs & Tape (1972–1984), Billboard Top 200 Albums (1984–1985), Billboard Top Pop Albums (1985–1991), and Billboard 200 Top Albums (1991–1992).

The chart is based mostly on sales—both at retail and digital – of albums in the United States. The weekly sales period was Monday to Sunday when Nielsen started tracking sales in 1991, but since July 2015, the tracking week begins on Friday (to coincide with the Global Release Day of the music industry) and ends on Thursday. A new chart is published the following Tuesday, post dated to the Saturday of that week, four days later. The chart's streaming schedule is also tracked from Friday to Thursday. Digital downloads of albums are included in Billboard 200 tabulation. Albums that are not licensed for retail sale in the United States (yet purchased in the U.S. as imports) are not eligible to chart. A long-standing policy rendering titles that are sold exclusively by specific retail outlets (such as Walmart and Starbucks) ineligible for charting, was reversed on November 7, 2007, and took effect in the issue dated November 17, 2007.

Record sales or music sales are activities related to selling music recordings (albums, singles, or music videos) through physical record shops or digital music stores. Record sales reached their peak in 1999, when 600 million people spent an average of $64 on records, achieving $40 billion in sales of recorded music.

Record sales started declining in the 21st century, which made artists rely on touring for most of their income. By 2019, record sales accounted for less than half of global recorded music revenue, overtaken by streaming. Following the inclusion of streaming into record charts in the mid-2010s, record sales are also referred to as traditional sales or pure sales.