SSL (Secure Sockets Layer) is a standard security protocol used to establish encrypted links between a web server and a browser. This encryption ensures that all data transmitted between the server and the client remains private and protected from eavesdropping or tampering. Although SSL has largely been replaced by its successor, TLS (Transport Layer Security), the term "SSL" is still commonly used to refer to website security certificates. SSL is essential for safeguarding sensitive information, such as login credentials and payment details, during online transactions.