SkillBridge exists to close a specific gap: the one between leaving a structured military job and starting a civilian one with no track record in that field. It lets eligible service members, during their final months on active duty, train or intern with an approved civilian employer, industry training program, or apprenticeship, while continuing to receive military pay and benefits instead of a civilian paycheck.
Done well, it turns your last months in uniform into a real trial run at a civilian career, sometimes leading directly to a job offer. Done poorly, or not at all, those same months just pass by. The mechanics of how the program works, and how to find a placement worth using it on, are worth understanding well before your separation date.