Plants vs. Zombies is a popular tower defense game where players must strategically place plants to defend against incoming waves of zombies. The game features a variety of different plants, each with their own unique abilities, as well as a wide array of zombies with different strengths and weaknesses. Players must strategize and adapt their defenses to survive increasingly difficult levels and protect their home from being overrun by the undead. With its quirky humor and addictive gameplay, Plants vs. Zombies has become a beloved classic in the world of casual gaming.