What is Google Sketchup?

Google Sketchup is a software that is used to create 3D models of anything you like. Things from like cars, houses, playgrounds and even to transformers. 

What’s it used for? What it could be used for?

Probably used for pre-designing models for objects that would like to be built over the years. Or even just seeing what you can make with just using your own imagination and just exploring what google sketchup can do.