A specialization or skill is an attribute assigned to Kerbals that indicates what abilities they can provide. Kerbals, with the exception of those with the Tourist specialization, can level up by earning experience, which may give them additional abilities specific to their skill.
List of skills
Engineers have the ability to repair broken parts and replace used parts, including repacking parachutes and repairing rover wheels. They can also boost the efficiency of the 'Drill-O-Matic' Mining Excavator.