Most Windows platforms have a 32 and 64-bit version. In simple terms, a 32-bit operating system can directly “see” and work with at most 4 gigabytes of memory (and for Windows, it’s 3.5 gigabytes as some of the address space is reserved.) A 64-bit operating system can see and work with a vastly greater amount of memory – far more than any computer today could physically hold. (In the olden days there were 16-bit, 8-bit and even 4-bit operating systems, but those days are thankfully long behind us!) The “X-bit” nomenclature refers to how many bits of data the operating system can address directly. Operating systems are often referred to as being 32-bit or 64-bit. How to Check if Windows 10 is 32 or 64-bit
