FLL (FIRST LEGO League) — Ages 4–16 (split into Explorer and Challenge divisions). Teams use LEGO Mindstorms robots on a small tabletop field. Focused on introducing younger kids to science, technology, and problem-solving through a research project and a robot game.FTC (FIRST Tech Challenge) — Grades 7–12. Smaller robots (18" cube max), smaller field (12'×12'), teams of 2–15 people. More affordable and accessible, with a bigger focus on programming and hands-on building.FRC (FIRST Robotics Competition) — Grades 9–12. Much larger robots (up to 125 lbs), full-sized field (~27'×54'), teams of 25+ people. Higher budget, more resources, and a more intense competition experience.What they all share: All three are run by FIRST, emphasize teamwork and Gracious Professionalism, and are designed as a progression — many FRC and FTC students started in FLL.