Astromech droid

An astromech droid is one one several versions of a droid used in starfighters to help and assist the pilot, whether it be calculating Hyperspace jumps or acting as a targeting computer. Several notable astromech droids were R2-D2, C1-10P, BB-8, R5-D4, and BT-1. There have been many different series of astromech droids, but the most universal and famous of these were the R2 series astromech droids (source needed).