It is 32-bit, like EISA, but you can't stick ISA cards into it. MCA was capable of bus mastering, plus it could look at other devices plugged into it and identify them, leading to automatic configuration. MCA also produced less electrical interference, reducing errors. MCA is history. Don't get it.
Nobody uses it.
This is a very fast interface made up mainly for fast new video cards. All of those fancy videos and graphics require much speed. VESA buses are basically an ISA slot with an extra slot on the end. The whole thing is about 4 inches longer than an ISA slot. This is the other very fast bus developed by Intel.