Often there is lot of confusion about certain software running only on 32 bit, the operating system being 64 bit etc. ? I think every computer user must know a little bit of theory as to what the difference between the two really is*. To be precise, 32 bit / 64 bit has to do with amount of memory (RAM) the processor can address. Yes, the first thing that we realise is 32 bit / 64 bit originally has to do with the processor more than anything else - software, operating system etc. If you think this is hard to understand recollect the basics of binary number system. How many different numbers can you represent using 1 bit ? Either the bit can be a zero or a one. Thus I can represent two numbers. How many different numbers can be represented using 2 bits ... four. In general using n bits I can represent 2^n different numbers. Now, for a processor each different number corresponds to a different location on your RAM. Thus a processor which has 32 bits at its disposal can address 2^32 me...