A COM file is an executable program file most commonly associated with older DOS and early Windows systems. The `.COM` extension originally referred to a command file, and unlike modern `.EXE` programs, traditional COM files use a very simple binary structure containing machine instructions that the computer can execute directly.

A COM file is an executable program file most commonly associated with older DOS and early Windows systems. The `.COM` extension originally referred to a command file, and unlike modern `.EXE` programs, traditional COM files use a very simple binary structure containing machine instructions that the computer can execute directly.