Learn how to enhance security in web applications using PKCE (Proof Key for Code Exchange) in this Developer Day 2021 conference talk. Explore the various OAuth grant types, focusing on the more secure options. Discover how PKCE builds upon the Authorization Code grant type and watch a live demonstration of its implementation in an application. Gain insights into secure authentication practices, including the use of code verifiers and background processes. Conclude with final thoughts on improving web app security through advanced authentication methods.