Question

what is form in computer(f.i.t)

Answer 1

F. I . T.  could mean the frequency of information transfer from one computer to another.

Form factor in a computer (hardware) is related to the specification of motherboard in a computer. It is the PCB (printed circuit board) standard for layout, number of connections or ports , sizes of the motherboard and the sizes of components etc.

These form factors help use of components (processors or other chips) from various vendors to be used in a motherboard.  So the usability, replaceability of components increases.

Each motherboard has a specific set of form factors.