Deno, a modern runtime for JavaScript and TypeScript, has raised $21M in an investment round led by Sequoia Capital. The company aims to simplify web development and provide a secure and fast runtime environment. Deno's products include Deno Deploy, a serverless hosting platform, and Deno Sandbox, a secure environment for running untrusted code. The investment will be used to hire engineers and pursue commercial applications for Deno's technology.