What is 32bit processor and what is 64bit processor?
First off, I'm assuming you know what a microprocessor is. If
not, please go look up that question (or, a related topic, the CPU
(Central Processing Unit).
32 and 64 bits processors refer to the size of the native
(default) word size in a processor. In a 32 bit processor, all
basic operations happen on chunks of information 32-bits in size -
information requiring more storage requires multiples of the 32-bit
word. Likewise, 64-bit processors operate with a native size of
64-bit words.
See the related question below for a more thorough explanation
of the impact of 32 vs 64 bit native word size in a processor.