What is 32bit vs 64bit?

A 32-bit system can access 232 different memory addresses, i.e 4 GB of RAM or physical memory ideally, it can access more than 4 GB of RAM also. A 64-bit system can access 264 different memory addresses, i.e actually 18-Quintillion bytes of RAM. … Most computers made in the 1990s and early 2000s were 32-bit machines.