What is the command in Unix or Linux to terminate processes without having to log out or reboot (i.e., restart) the computer?

What is the command in Unix or Linux to terminate processes without having to log out or reboot (i.e., restart) the computer?

• stop
• quit or q
• kill
• taskkill 

 

EXPLANATION

In Unix and Unix-like operating systems, kill is a command used to send a signal to a process. By default, the message sent is the termination signal, which requests that the process exit. But kill is something of a misnomer; the signal sent may have nothing to do with process killing.

SOURCE

https://en.wikipedia.org/wiki/Kill_(command)