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2024-04-17T00:00:52Z

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[[File:Client-server-model.svg|Client-server-model|thumb]] [[File:Wikimedia_Foundation_Servers-8055_35.jpg|Wikimedia Foundation Servers-8055 35|thumb|left]] [[File:First-server-cern-computer-center.jpg|First-server-cern-computer-center|thumb|left]] [[File:Server-based-network.svg|Server-based-network|thumb]] [[File:Inside_and_Rear_of_Webserver.jpg|Inside and Rear of Webserver|thumb]] [[File:DL380sREAR.jpg|DL380sREAR|thumb]] '''Server (computing)''' refers to a [[computer system]] or [[software]] that provides [[services]] to other computer programs and their users, known as [[client (computing)|clients]]. In the context of [[networking]], servers are powerful [[hardware]] or software systems that host, manage, and deliver resources or services to clients over a [[network]]. The primary function of a server is to share data, resources, or distribute workloads among multiple clients.

==Types of Servers==
Servers can be categorized based on their purpose and the services they provide. Common types of servers include:

* '''[[Web server]]''': Hosts [[website]]s and delivers [[web page]]s to clients upon request using [[HTTP]] or [[HTTPS]].
* '''[[File server]]''': Stores and manages files, allowing clients to upload, download, or access files stored on the server.
* '''[[Database server]]''': Provides database services, handling queries and returning results to clients.
* '''[[Mail server]]''': Manages and stores emails, facilitating the sending and receiving of email messages.
* '''[[Application server]]''': Hosts and executes applications for client devices, often used in complex business applications.
* '''[[Print server]]''': Manages one or more printers and handles printing requests from clients.

==Server Architecture==
Server architecture can vary widely depending on the service it provides. However, most servers operate on a client-server model where the server waits for requests from clients, processes them, and then sends a response back. Servers can be deployed on physical hardware, known as [[bare-metal server|bare-metal servers]], or as virtual servers utilizing [[virtualization]] technology to run multiple server instances on a single physical machine.

==Server Hardware==
Server hardware is typically more robust than that of a standard personal computer. Key components include:

* '''[[Central processing unit|CPU]]''': More powerful in servers for handling multiple requests.
* '''[[Random-access memory|RAM]]''': Higher capacity to manage simultaneous connections and data processing.
* '''[[Hard disk drive|Hard disk]]''' or '''[[Solid-state drive|SSD]]''': For storage, servers often use RAID configurations for redundancy.
* '''[[Network interface controller|Network interface cards (NICs)]]''': Often multiple, for handling high network traffic.

==Operating Systems and Software==
Servers run on specialized or standard [[operating system]]s designed for stability, security, and scalability. Popular server operating systems include [[Linux]], [[Windows Server]], and [[UNIX]]. Server software varies based on the type of service provided and can range from web server software like [[Apache HTTP Server]] and [[Nginx]], to database management systems like [[MySQL]] and [[PostgreSQL]].

==Security==
Security is a critical concern for servers due to their role in storing sensitive data and providing services over the internet. Common security measures include the use of [[firewall]]s, [[intrusion detection system|intrusion detection systems]], and regular software updates to protect against vulnerabilities.

==Conclusion==
Servers are a fundamental component of modern computing, enabling the functionality of the internet and many internal business networks. Their design and deployment vary widely depending on the needs of the users and the services provided.

[[Category:Computing]]
[[Category:Computer systems]]
[[Category:Network architecture]]
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