Gym badges are special awards given to trainers in the Pokémon video game series. They are earned by defeating gym leaders in battles, showcasing a trainer's skill and progress. Each badge represents a specific gym and often grants the trainer new abilities, such as using certain Pokémon moves outside of battle. Collecting gym badges is essential for trainers as it allows them to compete in the Pokémon League. The more badges a trainer has, the stronger their Pokémon can become, and it also increases their chances of success in challenging battles against other trainers.