First Tech Challenge (FTC) differs from First Robotics Challenge (FRC) in that robots are at most 18x18x18 inches. The FTC build season also takes place over a longer period of time, six months in comparison to six weeks. But both FRC and FTC teams design, code, and build their own robot while helping out in the community!
You can learn more about FTC on FIRST's official site here.
Both 310 and 479 have contributed to their communities through: