There are two things which look and act similar but are different, gadgets and widgets. Widgets can be referred to any icons or graphical interface element that is operated by a computer or internet use to execute a preferred function online or on the computer. You can add a widget in all kind of web pages. A gadget acts just like a widget, often fulfilling the same purpose, but it is proprietary or called to be self-contained. It only works on a certain website or a specific set of websites. For example, OpenSocial...