Android widgets are essentially live, functioning programs that appear right on your phone's home screen. They let you do things like scroll through your inbox or your calendar, flip through current forecasts for multiple cities, and adjust your phone's basic settings without ever having to open a program or leave the home screen.
A new wrinkle in Ice Cream Sandwich is that many widgets can be resized. Just press and hold any widget on your home screen, and if it's resizable, you'll see a blue box appear around it. Drag an edge of the box up, down, left or right to make the widget larger or smaller.