There are seven different types of units:
{|cellpadding="8" width="50%"|-
|
:* '''service''' - processes |Processes (daemons) start/stop/restart/reload:* |-|'''socket''' - define |Define communication channel (for other services)|-:* |'''device''' - recognise |Recognise hardware device (plug & play):* |-|'''mount''' - connect |Connect device to file system:* |-|'''automount''' - automatically |Automatically connect device to file system (bootup):* |-|'''target''' - groups |Groups related services (dependency):* |-|'''snapshot''' - reference |Reference other units
|}
'''NOTE: For this tutorial resource, we only focus on the <u>service</u> unit.'''