Deep learning is a revolution started. A revolution because it allows enterprises to create predictive models with uncanny accuracy on previously hard-to-analyze data such as images, voice, and natural language. A revolution because the internet giants have all embraced deep learning as their go-forward AI strategy. And, finally, a revolution because it has only just begun. Once a revolution gets big enough, it disrupts. That's the opportunity for application development and delivery (AD&D) professionals who build enterprise and customer applications. This is an update of a previously published report; Forrester reviews and updates it periodically for continued relevance and accuracy.