SSH (Secure Shell)

SSH provides encrypted communication for remote system administration. Key uses: remote shell access (ssh user@host), secure file transfer (scp, sftp), port forwarding (tunneling), and Git operations. Authentication methods: password (less secure) and public key (recommended). Key pairs consist of a private key (kept secret) and public key (shared with servers). SSH config (~/.ssh/config) simplifies connections with aliases and settings. Security best practices: disable password auth, use key-based auth, change default port, use fail2ban. SSH is fundamental for DevOps, server management, and secure development workflows.