Fork System Call
In plain terms
Creating a new process by duplicating the current one.
Going deeper
The fork() system call spawns a child process that's a copy of the parent, the classic Unix way to create processes. The child continues from the same point.
Under the hood
Copy-on-write makes it efficient; fork is often followed by exec to run a new program.
Examples
Process creation, fork()/exec(), Unix programming, shells, servers.
Think of it like...
Like cloning yourself to take on a separate task in parallel.