camping at Yosemite Park, CA?

I’m trying to get some info for The Yosemite National Park, and i was wondering if someone could help me with some terms:

a) what is the difference between “campground” and “campsite” ?
b) what does it mean Rv-Full hookup and RV-non hookup?
c) RV Site – Pull-thru – Water/Electric: why it is specified “water/electric”?
d) Campsite – Tent only – No hookups: what it means “No hookups”? Is this necessaryy for camping?

A…..campsite is where you put your tent, campground is everybody else’s campsite.
B…Rv-full hookup…is water/electric, rv-non hookup doesn’t have anything
C….call them…probably just a regular hookup\
D….no rv service…just tent only….plus I don’t think there is any sewer hookup……enjoy