A checksum is a number, in the form of a binary or hexadecimal value, that's been derived from a data source. The important bits to know are that it's typically much smaller than the source, and it's also almost entirely unique.
We've covered many ways that you can save space on your storage drives over the years and deleting duplicate files on your system could easily result in a sizable clean out if only a few large files are found. Although Windows doesn't provide a direct solution, there are many apps that can help, so here's a quick look at them.
As what may be the most common way to store and share multiple files, the ZIP file format is used by essentially everyone online. With that said, there's a good chance you'll eventually come across one that has been corrupted, but everything's not lost.
