Secure Shell, commonly known as SSH, and Telnet are two network protocols that have been used widely at one point in time or another. They are both used to connect to remote servers in order to facilitate some sort of communications. The primary difference, which also led to one superseding the other, is in security. SSH offers security mechanisms that protect the users against anyone with malicious intent while Telnet has no security measures whatsoever.
Read more: Difference Between Telnet and SSH | Difference Between | Telnet vs SSH http://www.differencebetween.net/technology/internet/difference-between-telnet-and-ssh/#ixzz407yAGUFd