What is 32 bit and 64 bit system?

A 32–bit system can access 2³² memory addresses, i.e 4 GB of RAM or physical memory. A 64–bit system can access 2⁶⁴ memory addresses, i.e actually 18-Quintillion bytes of RAM. In short, any amount of memory greater than 4 GB can be easily handled by it. So a 64–bit application is suitable for memory and data intensive applications such as computer-aided design (CAD) applications with huge design file sizes.