Ssh

Public-private key authentication is a method used on SSH (Secure Shell) servers to verify the identity of users connecting to the server. In this method, users must have a separate public-private key pair.

Automatic deployment is the process of releasing an application or system to production automatically without manual intervention. Node.js is a JavaScript runtime platform used to build web applications, while GitHub Actions is a service for automatically running scripts in response to GitHub repository activities, such as commits or releases.

SSH servers can be used to execute commands from connected systems, manage access rights to the server, or transfer files between systems securely. SSH servers are also often used as an additional layer of security on servers connected to a network.

The main difference between SCP and SFTP is that SCP can only be used for transferring files, while SFTP can also be used to add, delete, rename files, and manage file permissions.