TLS (Transport Layer Security) is a widely used security protocol that encrypts data transmitted over the internet. It ensures that sensitive information, such as passwords, credit card numbers, and personal messages, remains private and cannot be read or altered by unauthorized parties during transmission. TLS is the successor to SSL (Secure Sockets Layer) and is commonly used to secure web browsing (HTTPS), email, instant messaging, and other online communications. By providing authentication, data integrity, and encryption, TLS helps protect users from eavesdropping, tampering, and forgery.