Music charts are rankings that display the popularity of songs and albums over a specific period. They are typically based on sales, streaming data, and radio airplay. The most well-known chart in the United States is the Billboard Hot 100, which ranks the top songs each week. Other countries have their own charts, reflecting local music trends. These charts help listeners discover new music and track the success of their favorite artists. They can also influence the music industry, as high chart positions often lead to increased sales and concert attendance. Popular charts include the UK Singles Chart and the Billboard 200 for albums.