Explore the world of language servers in this EmacsConf 2023 talk, focusing on writing one in OCaml for Emacs. Learn about Semgrep, the Language Server Protocol, and how to show security bugs early in development. Dive into a case study of Rust Analyzer, understanding its benefits and applications. Discover the technical aspects of language server communication, LSP capabilities, and tips for writing your own. Follow along as the speaker demonstrates how to support a language server through LSP mode in Emacs, create a client, add it to the list of client packages, and incorporate documentation. Gain insights on adding custom commands and capabilities to enhance your Emacs experience with language servers.