Popular music. A collective genre, also referred to as Pop, Chart Music, Top 40, or Hits, it primarily focuses on wide circulation, sales and the marketability of the "artists" than on creative or artistic content. Pop can range from Dance, R&B, Rap, Country and Rock, but is generally the most "diluted" form of any genre it emulates. Pop songs generally have a 3-minute, hook/verse structure (although many ballads have made it to the charts) written for immediate likability, often written by corporate record label executives, and "pushed" by a front-person or people, commonly referred to as the artist or artists.
When initially identifying a pop artist, mass production and circulation are the biggest indicators. Check mainstream media/entertainment outlets, such as MTV, VH1, E!, Rolling Stone magazine, or the "New Releases" or "Heavy Rotation" section of the local music store.