Linux is a family of open-source Unix-like operating systems built around the Linux kernel. These systems are used on servers, personal computers, in cloud infrastructure, supercomputers, network equipment, embedded devices, and other computing systems.
Strictly speaking, Linux is the operating system kernel rather than the entire OS. It manages processes, memory, devices, and other hardware resources. A complete operating system typically includes the Linux kernel along with system utilities, libraries, management tools, and applications. Such packages are known as Linux distributions.
How Linux Is Structured
Linux has a modular architecture. The main system components perform different functions:
- Linux kernel — manages the CPU, memory, devices, file systems, networking, and other resources.
- System libraries — provide applications with standard functions for interacting with the system.
- System utilities — are used to manage files, processes, users, networks, and OS settings.
- Shell — allows users and administrators to control the system using commands. Common shells include Bash, Zsh, and Fish.
- Package management system — handles the installation, updating, and removal of software.
- Graphical environment — provides a graphical user interface when required.
Servers often operate without a graphical environment. Administrators manage the system through the command line, either locally or remotely, for example via SSH.
What Is a Linux Distribution?
A Linux distribution is a complete operating system that includes the Linux kernel and a set of software components selected by its developers. Distributions differ in their intended use, update frequency, package management system, included software, and support model.
Well-known Linux distributions include:
- Ubuntu — used on workstations, servers, and in cloud infrastructure
- Debian — a general-purpose distribution on which many other systems are based
- Red Hat Enterprise Linux (RHEL) — a commercial enterprise distribution
- Rocky Linux and AlmaLinux — distributions compatible with the RHEL ecosystem
- Fedora — a distribution characterized by relatively rapid adoption of new technologies
- SUSE Linux Enterprise — an enterprise Linux distribution
- Arch Linux — a flexible distribution with a rolling-release model
The choice depends on the intended use, stability and security requirements, required software, and availability of technical support.
What Linux Is Used For
Linux can be used as a general-purpose operating system, but it is particularly widespread in server and cloud infrastructure.
Common use cases include:
- web servers
- database servers
- file servers
- virtual machines
- container infrastructure
- cloud platforms
- backup systems
- network devices
- development and DevOps environments
- HPC and supercomputers
- embedded and IoT devices
A single Linux server can run multiple services simultaneously, such as a web server, database, monitoring system, and other applications.
Linux on Servers
Linux is widely used in server infrastructure because it allows administrators to configure systems flexibly and install only the required components.
Administrators can manage servers through the command line, automate operations using scripts, and centrally configure large numbers of machines.
For server workloads, Linux is used with software such as Nginx and Apache web servers, PostgreSQL and MySQL database management systems, container platforms, and various monitoring, automation, and virtualization tools.
Linux and the Command Line
One of the characteristic features of Linux is its extensive set of command-line tools. Almost all major administrative operations can be performed through a terminal, including:
- creating and deleting files
- managing directories
- installing software
- starting and stopping services
- viewing running processes
- changing access permissions
- configuring networks
- analyzing system logs
- connecting to remote servers
Commands can be combined into scripts, making it possible to automate repetitive tasks.
However, using Linux does not necessarily require working in the terminal all the time. Linux distributions for personal computers can provide a full graphical user interface.
Linux vs. Windows: What Is the Difference?
Linux and Microsoft Windows are different families of operating systems.
One of the main differences is their development model. The Linux kernel is distributed as open-source software, while Windows is a proprietary Microsoft product.
Linux offers extensive options for system customization and automation and is available in many different distributions. Windows is developed as a unified Microsoft product family and has its own ecosystem of software and administration tools.
Both platforms are used on end-user devices and servers. The choice depends on applications, infrastructure requirements, staff expertise, operating costs, and other factors.
Advantages and Features of Linux
Key characteristics of Linux include:
- open-source kernel
- a large number of distributions
- extensive customization options
- powerful command-line tools
- support for administration automation
- support for various hardware platforms
- widespread use in server and cloud infrastructure
- a comprehensive permissions and access control system
At the same time, working with Linux may require specialized knowledge, particularly when administering servers. In addition, the availability of specific commercial software and drivers depends on the distribution and hardware being used.