A Linux server is a computer system that runs on the Linux operating system and typically performs tasks such as network services, application hosting or database management.

Linux server operating systems are preferred for reasons such as being open source, reliability, performance, customizability, and free licensing.

SSH (Secure Shell) is a protocol that provides secure remote access. It is often used on Linux servers because it provides encrypted connections.

Basic security measures are taken such as regular updates, use of strong passwords, and correct configuration of firewalls.

Cloud services can reduce traditional infrastructure costs, such as purchasing, installing and maintaining physical infrastructure. Moreover, since the payment model is generally based on the resources used, you are only paid for the resources actually used.

The firewall is installed and configured using tools such as iptables or ufw.