A Linux Server is a computer system that runs on the Linux operating system, designed to manage network resources and provide services to other computers. It is widely used for hosting websites, managing databases, and running applications due to its stability, security, and flexibility. Unlike traditional servers, Linux Servers are open-source, meaning their source code is freely available for anyone to modify and distribute. This allows for a wide range of customization and optimization, making them popular among developers and businesses looking for cost-effective solutions.