A digital signature for a Word document is an electronically generated set of data that you attach to your document as a way to identify yourself and verify the document’s content. Think of it like your personal “stamp” that ensures that no one else can tamper with or misuse your document. When you add a digital signature to your Word document, you’re essentially guaranteeing that the document has not been changed since it was signed—giving you peace of mind and providing extra security when sending documents out into the world.