Definition:
SSH, also known as Secure Socket Shell, may be a network protocol that gives administrators with a secure way to access a remote computer. SSH also refers to the suite of utilities that implement the protocol. Secure Shell provides strong authentication and secure encrypted information communications between 2 computers connecting over an insecure network like the internet. SSH is wide utilized by network administrators for managing systems and applications remotely, permitting them to log in to a different computer over a network, execute commands and move files from one computer to a different.
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Further Reading:
Book: Testing Practitioner Hanbook by Renu Rajani.