It's the first one on open source softwares series. If you are not into 3d softwares, then in short - It is the place where magic happens. The cartoons, the 3d movies(like toy story, cars, incredible etc. ) and movies with visual effects(best example avatar) are made with a 3d software!(⚠️ The above mentioned movies and not made with blender) Blender is a complete 3d toolset with modelling, texturing, rigging, animation and its own renderer and is completely free. You can create your own robot, house or even yourself in blender! (well the last one is really hard) If you are interested in blender now, then you can visit its website- www.blender.org