is responsible for what option Check mime type?

I set up the script and found the option Check mime type.
Please explain podrodbnee about this option . Under what conditions does it turn on / off
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@Artem Shymilov - When php's fileinfo extension is installed on the server, and you upload a "csv" file, then fileinfo sometimes get it wrong, although it is a csv file, fileinfo can't recognize it and doesn't let you upload a perfectly valid csv file. In this case, you can turn off the checking of mime type. Mailwizz has fallback checks anyway.