A small, single-purpose application that provides quick, at-a-glance information, or quick access to simple interactive functions. Widgets are simpler and faster to access than full applications (apps) that may provide more functionality.
Most widget platforms are designed around small widgets that only take up part of the screen, so that you can access several widgets at once. These widgets may be located in a dedicated widget area, or on the home screen / lock screen, making them quick to access.
Examples of common widgets include ones that display basic weather information, news headlines, a clock, upcoming appointments, social network updates, web search entry, or a flight mode switch.
There are several different, incompatible widget platforms. (A widget designed for smart TVs generally won't work on an Android phone, for example.)