TensorFlow is an open-source software library for dataflow and differentiable programming across various tasks. It is a platform for building machine learning models, focusing on the training and inference of deep neural networks.

TensorFlow allows users to define and execute computations as a graph of tensors, which are multi-dimensional arrays. The library provides a range of tools and libraries for implementing and training machine learning models, as well as deploying models in a production environment. TensorFlow supports a wide range of platforms, from computers to cloud-based systems, and can be used for both research and production purposes.