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It never ends
Force make command to create as many compile processes as specified (4 in the example), so that each one goes into one core or CPU and compilation happens in parallel. This reduces the time required to compile a program by up to a half in the case of CPUs with 2 cores, one fourth in the case of quad cores... and so on.
Colorize output of make, gcc/g++ or diff, making it easier to read at a glance.
They are not distributed with make, diff or gcc, but are usually available in the repositories.