The HTTPS (HyperText Transfer Protocol Secure) protocol is commonly used for secure web communication. It ensures that data transmitted between a user's browser and a website is encrypted, safeguarding sensitive information like passwords and credit card numbers. This encryption prevents interception by third parties, thus providing a layer of security that is essential for e-commerce and online transactions. By using HTTPS, websites can enhance trust and credibility, informing users that their data is being transmitted safely and securely.