PHP - What is the difference between the functions unlink and unset?

What is the difference between the functions unlink and unset?

Unlink
It is used to delete the file used in the context.

Example :
unlink('test.html');

Unset
It is used to unset or destroy the variable.

Example :
unset($var);

If a global variable is attempted to "unset" inside a function, the local variable is destroyed.

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