What is "grapher"

Grapher is a computer program bundled with OS X since version 10.4 that is able to create 2D and 3D graphs from simple and complex equations. It includes a variety of samples ranging from differential equations to 3D-rendered Toroids and Lorenz attractors. It is also capable of dealing with functions and compositions of them. One can edit the appearance of graphs by changing line colors, adding patterns to rendered surfaces, adding comments, and changing fonts and styles used to display them. Grapher is able to create animations of graphs by changing constants or rotating them in space.