Best-selling albums are music records that have sold a significant number of copies, often reaching millions worldwide. These albums are typically measured by their sales figures, which can include physical copies, digital downloads, and streaming equivalents. Some of the most famous best-selling albums include Michael Jackson's "Thriller" and The Beatles' "Abbey Road". The success of a best-selling album can be attributed to various factors, including popular singles, critical acclaim, and effective marketing. Many artists, such as Adele and Eagles, have achieved best-selling status, making a lasting impact on the music industry and influencing future generations of musicians.