Baseball cards are collectible trading cards featuring professional baseball players. Each card typically includes a photo of the player, their name, team, and statistics. These cards are often produced by companies like Topps and Panini, and they come in various sets and designs. Collectors often seek rare or vintage cards, which can increase in value over time. Many people enjoy trading cards with friends or completing sets, while others may invest in them as a hobby. The popularity of baseball cards has led to a vibrant market, with some cards selling for thousands of dollars at auctions.