16 Bit and 32 bit program

What is the difference between a 16 bit program and a 32 bit program?
Plus, is there a 64 bit program.
Thanks

It basically refers to the address space of a computer. To address a memory location the processor loads an address into a register. If the width of this register is 16 bit the computer is often called 16 bit, and the programs written for it 16 bit programs. This is the BASIC explanation. There are lots of modifications, for example the JVM. It can be seen as a software computer with a 32 bit address space. So Java programs are always 32 bit regardless of what computer they run.
Most computers today are 32 bits, but the general tendency is towards wider address spaces so 64 bit's in the pipeline.

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