The talk is about Livebook, a computational notebook tool for Elixir. The speaker introduces Livebook and explains how to install and use it. They discuss the benefits of Livebook, including the ability to start in the middle of a project and the transparency and collaboration it offers. The speaker goes on to share three different use cases for Livebook, including using it to interact with a legacy API, creating a concurrent ETL pipeline, and connecting to a live running instance. They also cover how to integrate Livebook with other projects and how testing works in Livebook. The speaker concludes by mentioning two additional resources related to Livebook, the Dockyard Academy curriculum and Project Bumblebee.