A legal document signature is a mark or indication of agreement, typically placed on a contract or other legally binding document. This signature is often affixed by the parties who’ve agreed to the terms implied in the document, and serves as their mutual acknowledgement that they are in agreement to all that has been written therein. A legal document signature must be individual and unique – no two signatures will ever be deemed to be the same. Furthermore, it serves as evidence that both sides have read and accepted the contents of the document, and so carries with it legal authority and validity.