HTTPS is a protocol used for secure communication over a computer network, primarily the Internet. By using encryption methods such as SSL (Secure Socket Layer) or TLS (Transport Layer Security), HTTPS ensures that all transactions between the client (user's web browser) and the server (website) are encrypted. This means that third parties cannot easily intercept or tamper with the data being transmitted. HTTPS is particularly important for protecting sensitive information such as login credentials, personal data, and payment details. It has become essential for establishing user trust, especially in e-commerce and online services.