The How We Roll series by Clerk provides guidance on implementing authentication, with Chapter 4 focusing on email verification, a crucial component in modern authentication systems. This chapter outlines the various uses of email verification during sign-up, sign-in, and account management, emphasizing its role in preventing spam and ensuring valid user accounts. Although traditional methods like verification links and one-time passcodes are still in use, Single Sign-On (SSO) with social and enterprise providers has become the dominant method, responsible for over half of email verifications. The chapter discusses the trade-offs of immediate versus delayed verification and how developers can use Clerk to customize these processes. It also highlights the importance of ensuring that SSO providers adhere to the OpenID Connect protocol to prevent security vulnerabilities, as inconsistent email verification can lead to account takeovers. Clerk offers developers flexibility in choosing verification methods and emphasizes the need for thorough auditing of SSO providers to maintain security and a seamless user experience.