Sports cards are collectible trading cards featuring professional athletes from various sports, such as baseball, basketball, football, and hockey. These cards typically display a player's image, statistics, and team information. They are produced by companies like Topps and Panini and come in various formats, including standard cards, autographed versions, and limited editions. Collectors often buy, sell, and trade sports cards, with some rare cards fetching high prices at auctions. The value of a card can depend on factors like its condition, rarity, and the popularity of the player. Many enthusiasts enjoy building complete sets or focusing on specific players or teams.