TensorFlow Hub serves as a repository for machine learning models trained on specific datasets, allowing users to contribute or access models tailored for various use cases. It facilitates transfer learning by providing ML models as libraries or web API calls, available for download to source code runtimes with a single line of code.
TensorFlow Hub covers diverse problem domains such as text, images, video, and audio. The repository offers pre-trained models, like BERT and Faster R-CNN, for easy reuse with just a few lines of code, making it a valuable resource for machine learning practitioners.