What is the difference between 32 bit and 64 bit windows?

A question that I’ve been asking for a very long time, but never cared to look for an answer

I thought the difference is not a big deal, u just need to know wether you run a 32 bit or a 64 bit windows when you want to download a certain programs, and that’s it. It turns out that there is actually a big difference that we should understand; especially of you are going to get a new computer, or upgrade your old one

Every CPU has a register, which is a small storage space that the CPS uses to keep the data it wants to access quickly, the register thus helps in optimize your computer performance (as it finds the data it need to access quickly without wasting time)

Now the 32 bit and 63 bit thingy, refers to the size (width) of the register, so a 64 bit register is wider than the 32 bit one, and can hold more data, so the computer can access more data quickly and thus boost your performance, handel more tasks, & improve memory utilization

A 32 bit register supports RAMs up to 4G only, and for me I think that is the main implication

So we can say that 64 bit registers can have more RAM (theoretically speaking up to 170billion GB, if they ever manage to invent such a thing), use RAMs more efficient, increase the computer speed, however  some of the drivers for the old devices might not be supported, legacy software (old software) might not be supported too, and you have to  make sure that your mother board would support the extra RAM you are planning to add if you decide to switch to 64 bit system

Reference:  howtogeek.com’s article HTG Explains: what is the difference between 32 bit & 64 bit windows?