In this code cast will be making a small document signing app kind of like doc you sign here. So the basic concept is that a user can sign inside of this box with their mouth. And when we click on safe, then even after a user refreshes the web page, their signature is still seen here inside this box. And we also have some additional features to this small web app, for example this clear button which will clear the canvas of the signature. And we can choose to sign either with blue or black. So for example we can choose to sign with a blue and then we have the safe button here so that the signature remains after we refresh the webpage and we will be doing this using canvas api.