LEGO sets are construction toys that consist of interlocking plastic bricks, allowing users to build a wide variety of structures and models. Each set typically comes with a specific theme, such as Star Wars, Harry Potter, or City, and includes instructions for assembling the featured design. These sets vary in complexity, catering to different age groups and skill levels. Some sets are simple and suitable for young children, while others are intricate and designed for older builders. LEGO encourages creativity and problem-solving, making it a popular choice for both play and educational purposes.