Which protocol is often used for secure data transmission over the internet?

Secure Sockets Layer (SSL) is the protocol chosen for secure data transmission over the internet. It is designed to establish an encrypted link between a web server and a client, ensuring that sensitive data such as personal details, passwords, and credit card information is transmitted securely. SSL uses various cryptographic techniques to authenticate the communicating parties, ensuring that the data remains private and integral during transmission.

In contrast, Transmission Control Protocol (TCP) is primarily responsible for establishing and maintaining a connection for data transfer, but it does not provide encryption or security features. File Transfer Protocol (FTP) is used for transferring files over a network but lacks secure transmission by default, making it vulnerable to interception. HyperText Transfer Protocol (HTTP) is the foundation of data communication on the web but operates without built-in security, which means that data transmitted using HTTP can be easily accessed by unauthorized users. Thus, SSL is the correct choice when it comes to secure data transmission online.