Web application security is crucial for protecting online platforms from cyber threats. It involves implementing measures to safeguard applications from unauthorized access, data breaches, and malicious attacks. Key practices include input validation, secure coding, encryption, and regular security testing. By preventing vulnerabilities such as SQL injection, cross-site scripting (XSS), and cross-site request forgery (CSRF), organizations can ensure the integrity, confidentiality, and availability of their web applications. Strong web security not only protects sensitive user data but also maintains the trust and reputation of the organization, making it an essential aspect of modern digital operations.