The term deed, which dictionaries usually translate as « writing, » has something to do with the terms we just saw, but it has a different structure. Moreover, it is not a question of a bilateral or multilateral agreement such as a treaty, but of materializing itself into a single expression of will. For the deed to be valid, several formalities must be completed. There must be a written statement from the person granting a right to another and it must be expressly stated that it is a deed. In addition, it is necessary to deliver the document to the addressee of the promise and, as a rule, the signature of at least two witnesses at the end of the deed who confirm that the signature of the person issuing the document is authentic. However, this is only a conceptual differentiation.