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What's a digital signature?

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A digital signature: -
Allows you to verify the publisher of a file.
Verifies that the file has not changed since it was digitally signed.
What if a file does not have a valid digital signature?
If the file does not have a valid digital signature, there is no way for you to be sure that the file is actually from the source it claims to be from, or that it has not been tampered with (possibly by a virus) since it was published. It's safer to avoid opening the file unless you know for certain who created it and whether the contents are safe to open.
Does a valid digital signature mean that the file is safe?
A valid digital signature does not verify that the contents of the file are harmless. You must decide if you should trust the contents of the file.

And it is ussefull for Data Execution Prevention to know that the signed softwares does not need to be scanned if I know good It's only helpfull for the antiviruses to skip scanning them.