HyperText Transfer Protocol Secure (HTTPs) is an extension of the standard HTTP protocol that adds a layer of security by encrypting data transmitted between a web server and a user's browser. HTTPS uses SSL (Secure Sockets Layer) or TLS (Transport Layer Security) to ensure that sensitive information, such as login credentials, credit card details, and personal data, is securely transmitted over the internet. Websites using HTTPS are identified by a padlock icon in the browser's address bar. HTTPS is critical for protecting user privacy and securing online transactions, and it has become the standard for modern websites that handle sensitive information.