TensorFlow is the Google built open source software library for machine intelliegence.
Per Google: TensorFlow is an open source software library for numerical computation using data flow graphs. Nodes in the graph represent mathematical operations, while the graph edges represent the multidimensional data arrays (tensors) communicated between them.
This article assumes that you have a basic knowledge of the terminal, node, homebrew, and the command line -- and that you are working on a Mac (directions could be adjusted for a PC, but that's not what they're written for). This article also assumes that you do not have a working knowledge of python or anaconda.
Check your version of python:
$ python --version