Sign on the dotted line. It's a common phrase that's repeated in countless settings, from high-stakes business deals to everyday restaurant transactions. We all understand that, in most cases, a signature is the key to creating an official, legally binding contract or agreement. 

However, as the world becomes increasingly connected, more and more business is being conducted remotely. Instead of face-to-face meetings and paper contracts, we use electronic forms and online delivery methods. As a result, the definition of the term signature has evolved.