Since anyone with access to these files gains immense information about the user, deleting these files is the easiest way to prevent this. As such, CCleaner can assist in getting rid of cache files and browser cookies which store private data. This is hardly a concern nowadays, given that hard disks come cheaper with greater storage capabilities.
The first use case this definition brings to mind is freeing up memory from the hard disk. CCleaner is a utility program which helps in getting rid of potentially unwanted files and invalid Windows registry entries from a computer.
