Checkboxes allow users to perform quick actions on settings that are binary, as they ideally only have an "on" and "off".

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Best practices 

• Use a checkbox control for fields that only include an "on" or "off" state.
• Ideally a checkbox should only be used if it's state and infered consequences are clear to users. For example, accepting a Terms and Conditions.
• Group multiple related checkboxes with a group title to set a common context for the group.
• Avoid using checkboxes that conditionally enable other checkboxes. Ideally use a group of radio buttons to clearly expose each choice.
• When faced with a more complex use case that requires explaining each state, it is recommended to use a radio button group instead of a checkbox.
• When a checkbox is responsible for changing a setting, it should be included as a part of a form, which must be submited by the user. In cases where a setting is to be applied immediately a toggle control is the recommended solution. 
   

Anatomy