Bloons Tower Defense is a popular tower defense game series where players strategically place towers to pop incoming balloons, known as bloons. Each type of tower has unique abilities and can be upgraded to enhance its effectiveness against increasingly challenging waves of bloons. The game features various maps and modes, allowing players to choose different strategies. As players progress, they earn in-game currency to unlock new towers and upgrades. The goal is to prevent the bloons from reaching the end of the path, making it a fun and engaging challenge for players of all ages.