The Billboard 200 is a record chart ranking the 200 most popular music albums and EPs in the United States, published weekly by Billboard magazine. It is frequently used to convey the popularity of an artist or groups of artists. Often, a recording act will be remembered by its "number ones", those of their albums that outperformed all others during at least one week. Example:Friday January 1 – sales tracking week beginsThursday January 7 – sales tracking week endsTuesday January 12 – new chart published, with issue date of Saturday January 23.