Email Authentication is a process that verifies the identity of the sender of an email. It helps ensure that the email is genuinely from the person or organization it claims to be from, reducing the risk of phishing attacks and spam. Common methods of email authentication include SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting & Conformance). These methods work together to check if the email comes from an authorized server and if the content has not been altered during transmission. By implementing email authentication, businesses and individuals can protect their communications and maintain trust in their email interactions.