SketchUp is a 3D modeling program designed for architects, civil engineers, filmmakers, game developers, and related professions. It also includes features to facilitate the placement of models in Google Earth. It was designed to be easier to use than other 3D CAD programs. A feature of SketchUp is the 3D Warehouse that lets SketchUp users search for models made by others and contribute models.
This can be used for rough drafts of future models. It can also be used for designing or redesigning a building or structure. Lots of playgrounds, kitchen scenes, inside of buildings, etc… are first designed and made in Google SketchUp.
Also google sketchup could be very useful for things such as redecorating ur house or say if you would want to build your own house , you could use this program to plot this all out and then get down to the building part of the house.