Secure Shell (also known as SSH) is a way of securely sending data over the internet between two computers. This means that if someone else was trying to spy on your data, they wouldn't be able to see what you're doing. It's like having a secret code that only you and the other person know so that nobody else can understand it. You can use SSH to log into other computers, transfer files, and even send emails. It's like having a secure tunnel through the internet that nobody else can get through.