A computer can safely connect to another computer over an insecure network using the network protocol known as SSH (Secure Shell). having a common understanding on how to communicate, similar to the internet. SSH is a protocol for the application layer (7th layer of the OSI model). It is a helpful tool since you can easily connect to it via the internet, eliminating the need to physically access another system. As a result, it enables us to remotely manage servers.

Additionally, SSH was developed to replace Telnet when it first debuted in the mid-1990s. Another application-layer protocol that transmitted data without encryption was telnet. Data will be transmitted over the internet in plain text if encryption is not used. Anyone between you and the remote machine who had a packet sniffer could see all the data you were transferring as well as pretty much everything else you were doing.

Others may be able to see data that is sent in plain text. One method of making a piece of data unreadable without the ability to decode or decrypt it is through encryption. SSH was developed as a safe method of communication that encrypts data across a tunnel so that malicious parties cannot access it while it is transferred. With SSH, you can still monitor the flow of data and see how much of it is happening. You cannot, however, see the data itself.