Hypertext Transfer Protocol (Secure) / Development Terms Hypertext Transfer Protocol (Secure) Hypertext Transfer Protocol Secure, abbreviated as HTTPS, is the secure version of HTTP, the protocol used to transfer data between a web browser and a website. HTTPS encrypts the data exchanged during each session using Transport Layer Security (TLS), previously known as Secure Sockets Layer (SSL). This encryption protects sensitive information such as login credentials, credit card numbers, and personal data from being intercepted or tampered with during transmission. When a website uses HTTPS, the address in the browser begins with “https://” instead of “http://” and usually displays a padlock icon, signalling that the connection is secure. To use HTTPS, a website must obtain and install a digital SSL certificate from a trusted certificate authority (CA). This certificate verifies the website’s identity and enables secure communication between the server and the user’s browser. HTTPS is essential for online transactions, login portals, and any page that collects or displays private information. Beyond security, HTTPS also contributes to user trust, improved site performance and stronger search engine rankings. Google gives preference to HTTPS-enabled sites and may display warnings in Chrome for pages that are not secured. For nonprofits, HTTPS helps protect donor data and establishes credibility. For B2B and e-commerce sites, it reassures users that the site is legitimate and that their data is safe. Migrating from HTTP to HTTPS is a key step in maintaining a secure and search-friendly web presence.