Difference between “system” and “exec” in Linux?

Question

What is the difference between system and exec family commands? Especially I want to know which one of them creates child process to work?

Answer 1

exec() replaces the current running process with the process image of the function being performed..only executable files can be invoked using this.

system() forks off a new process implicitly to service the request and returns the value it obtained through the child process it forked initially.It uses the system's default shell to carry out the operation.