Answer: HTTP (Hypertext Transfer Protocol) and HTTPS (Hypertext Transfer Protocol Secure) are both protocols used for transferring data over the internet. The key difference between the two is security. HTTP is not secure and sends data in plain text, making it susceptible to eavesdropping and tampering. HTTPS, on the other hand, uses encryption to secure the data being transmitted, ensuring that it cannot be easily intercepted or altered by malicious third parties. This is achieved through the use of an SSL/TLS certificate, which encrypts the data before transmission and decrypts it upon receipt.