Understand
Blender is an all-in-one 3D modelling and animation suite. It can be used to produce computer-generated images and movies. It is open source freeware, so it costs nothing to use.
Blender was originally developed by Dutch company NeoGeo, then made available as a commercial product by subsidiary Not A Number. When NaN shut down, one of its founders set up the not-for-profit Blender Foundation and worked to raise funds to buy the rights to Blender. Consequently, Blender is now under the GNU General Public License which makes it open source and free for anyone to use.
There are many other 3D modelling suites, but some of them cost thousands of dollars. Blender costs not a single penny.