A paintball marker is a device used in the sport of paintball to shoot small, round capsules filled with paint. These markers operate using compressed air or CO2 to propel the paintballs at high speeds. They come in various styles, including mechanical and electronic, allowing players to choose based on their preferences and skill levels. Most paintball markers have a hopper that holds the paintballs and a barrel that directs the shot. Safety features, such as a trigger lock and barrel cover, are essential to prevent accidental firing. Proper maintenance and cleaning are crucial for optimal performance during games.