and to add to what's been said...
UV's are 2D coordinates ((u,v) if you will), that are projected onto 3D space ((x,y,z) coordinates)
uv-coordinates go between 0 and 1
their use and difference to verts has already been said
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D