Slither.io is an online multiplayer game where players control a snake-like creature. The objective is to grow your snake by consuming colorful pellets scattered throughout the game arena. Players can compete against others from around the world, making it a fun and competitive experience. As players consume more pellets, their snakes become longer and faster. However, if a snake collides with another snake, it will be eliminated. This adds a strategic element to the game, as players must navigate carefully to avoid being hit while trying to outmaneuver their opponents.