What is Bits?
The number of bits in a processor refers to the size of the data types that it handles and the size of its registry.

What is 32 Bit ?
In computer architecture, 32-bit integers, memory addresses, or other data units are those that are at most 32 bits (4 octets) wide. Also, 32-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. 32-bit is also a term given to a generation of microcomputers in which 32-bit microprocessors are the norm.

What is 64 Bit ?
In computer architecture, 64-bit computing is the use of processors that have datapath widths, integer size, and memory addresses widths of 64 bits (eight octets). Also, 64-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. From the software perspective, 64-bit computing means the use of code with 64-bit virtual memory addresses.

What is the difference between 32-bit and 64-bit ?
In computing, 32-bit and 64-bit are two different types of processors. The bit number (usually 8, 16, 32, or 64) refers to how much memory a processor can access from the CPU register.
64-bit processors are capable of twice the number of computations per second of a 32-bit processor. It means 64-bit has capability to perform more faster than 32-bit. Now a days All manufactures developing their own products based on 64-bit So you can say 64-bit will be a future of computer but there are many software programs which doesn't support a 64-bit OS. They are upgrading there services soon we will see how 64-bit performing in every home, office and other places. It is important to note that 64-bit computers can still use 32-bit based software programs, even when the Windows operating system is a 64-bit version.
One more difference between 32 bit and 64 bit that is the maximum amount of memory (RAM) that is supported. 32-bit computers support a maximum of 3-4 GB of memory, whereas a 64-bit computer can support memory amounts over 4 GB. This is important for software programs that are used for graphical design, engineering design or video editing, where many calculations are performed to render images, drawings, and video footage.
64-bit processors are becoming more and more common place in home computers. Most manufacturers build computers with 64-bit processors due to cheaper prices and because more users are now using 64-bit operating systems and programs. Computer parts retailers are offering fewer and fewer 32-bit processors and soon may not offer any at all.
At the end I want to say if you are planning to purchase a new Operating system get a 64-bit architecture system otherwise soon you will trash it as well if our system has more than 4 GB RAM then start using 64-bit system right now for getting benefit and experience the speed.  

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