how does uninstalling a software work? Why is it so quick, when installing takes longer?
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Installing something requires writing the data to the hard drive and adding an entry of where that file is stored to the drive’s table of all files.
Deleting a file just means removing that entry on the table. It’s much faster. Typically uninstalling a software involves a program simply deleting all the files unique to that software.
And yes, this does mean that the data from deleted files is still there until it gets overwritten. Programs like Recuva can be used to recover recently deleted files, and they’re reasonably effective.
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