How can file be permanently deleted but still recoverable

Hi
why do people say that they have deleted a file from their computer but if
someone has enough knowledge or certain forensic software they can still
retrieve this file that was supposably deleted. If they can retrieve it then
it is not deleted. and when the file is supposably deleted but still in your
computer is there a difference in the space that it takes in hidden areas of
your computer. I would imagine that they would be compressed or sometthing
else.
.

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