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The 
kill
 and 
killall
 commands can be incredibly useful in the situation of a stuck 
process, but these are commands you would hope you don't have to use very often. 
Stuck processes can occur in situations where applications encounter a situation from 
which they can't recover, so if you constantly find yourself needing to kill processes, 
you may want to check for an update to the package responsible for the service or 
check your server for hardware issues.
In the next section, let's take a look at system processes that run in the background 
and provide a service to us or our users, such as a web server process or DHCP 
server.