Keras is a high-level framework for building and training deep learning models with relatively low amounts of code. It’s designed to make creating neural networks as simple as possible.
Although, it doesn’t run on its own. Keras is a front-end wrapper that runs on top of more complicated tools– TensorFlow or Theano. This means that you make your model in Keras, but behind the scenes it’s being converted to TensorFlow or Theano code.
One helpful feature of Keras is that it is designed to have best practices built in, so using the default settings is usually a safe bet. This makes it even easier for beginners.
Joshua Bowen's Notes 
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