What is SSL/TLS?
SSL stands for Secure Sockets Layer. In short, it’s a protocol for maintaining a secure connection and protecting sensitive data. Transport Layer Security (TLS) is the successor to SSL. It is a cryptographic protocol that provides a safe connection over any given computer network.

More About SSL/TLS
SSL/TLS facilitate a secure connection between two systems. These can be a server and a client (for example, a shopping website and browser) or two servers.
SSL/TLS ensures that any data transferred between users and sites or between two systems remains impossible to read. This technology uses encryption algorithms to scramble data in transit, preventing hackers from reading it. This information could be sensitive or personal, such as credit card numbers, names, addresses, or other financial information.
TLS is merely an updated, more safeguarded SSL version. However, these security certificates are still commonly referred to as SSL.