The full form of HTTPS is HyperText Transfer Protocol Secure. HTTPS is a combination of the Hypertext Transfer Protocol (HTTP) with the Secure Socket Layer (SSL)/Transport Layer Security (TLS) protocol. TLS is an authentication and security protocol widely implemented in browsers and web servers. SSL works by using a public key to encrypt data transferred over the SSL connection. HTTPS is used to provide secure communication over a computer network and is widely used on the internet. It encrypts the entire message substance, including HTTP headers and the data for request or response, and allows for a trusted third party to sign server-side digital certificates, ensuring authentication. If a website has an SSL certificate installed, then the URL of that website will be HTTPS, and the website will be considered secure.