Keras is an open-source high-level neural network API written in Python that runs on top of other deep learning frameworks like TensorFlow. It provides a user-friendly interface for building and training neural networks without the need for low-level coding.
Keras simplifies the process of model building with simple methods to define layers, compile models, and fit them to data. TensorFlow 2.x fully integrates Keras as its high-level API, offering a seamless environment for building deep learning models.
Keras is widely popular for rapid prototyping and experimentation due to its simplicity, while TensorFlow provides the scalability and performance needed for production environments.