HTTPS, or Hypertext Transfer Protocol Secure, is an extension of HTTP that uses encryption to secure data exchanged between a user's browser and a web server. This ensures that sensitive information, such as passwords and credit card numbers, is transmitted safely over the internet. By utilizing protocols like SSL or TLS, HTTPS protects against eavesdropping and man-in-the-middle attacks. Websites that implement HTTPS display a padlock icon in the address bar, indicating a secure connection. This has become essential for maintaining user trust and safeguarding online transactions.