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As a military spouse, there are many acronyms you will hear and use. PCS is one of thos acronyms. The short answer is that PCS = move. Here's a more detailed answer...
In the United States Armed Forces, a permanent change of station (PCS) is the official relocation of an active duty military servicemember – along with any family members living with her or him – to a different duty location, such as a military base. A permanent change of station applies until mooted by another PCS order, completion of active duty service, or some other such preemptive event.
This should not be confused with a permanent change of assignment (PCA), which describes the reassignment of active duty personnel to a new unit within the same military post.
This term is also used for other United States government employees, such as a Foreign Service Officer, special agent, diplomats, and other civilian, non-military personnel, being stationed in embassies and consulates around the world.
In contrast, a temporary duty assignment is a shorter-term change of station, usually less than six months.