Deep Fake
A technology that overlays a video with different audio or video, in order to make a real-looking video of somebody saying or doing something. A famous example could be a deepfake of Nancy Pelosi (in May 2019) that caught a lot of news attention before being recognized as an authentic-seeming deepfake.
Deep Learning
Deep learning is an artificial intelligence function that imitates the workings of the human brain in processing data and creating patterns for use in decision making. Deep learning is a subset of machine learning in artificial intelligence (AI) that has networks capable of learning unsupervised from data that is unstructured or unlabeled.
Deep Web
The entirety of the web that is not accessible by search engines. For instance, online banking pages, legal and government documents, or scientific reports have no reason to be indexed. The Dark Web is part of the Deep web.