The relationship and difference between Keras and TensorFlow

TensorFlow and Theano and Keras are deep learning frameworks, TensorFlow and Theano are more flexible and difficult to learn, they are actually a differentiator.

Keras is actually TensorFlow and Keras interface (Keras as the front end, TensorFlow or Theano as the back end), it is also very flexible, and relatively easy to learn. You can see the Keras as an API after the TensorFlow package.

Keras's author François Chollet, who works at Google, now Keras seems to have become the official TensorFlow API.