# client-server model

> distributed application structure in computing

**Wikidata**: [Q146813](https://www.wikidata.org/wiki/Q146813)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Client–server_model)  
**Source**: https://4ort.xyz/entity/client-server-model

## Summary
The client-server model is a distributed application structure in computing where clients request services or resources from servers. This architectural pattern separates the client (requesting services) from the server (providing services), forming the foundation for many modern networked applications and services.

## Key Facts
- The client-server model is classified as both a software architecture and a network architecture, representing a high-level structure for software systems.
- It is considered the opposite of the peer-to-peer architecture in distributed computing.
- The model includes the software components of both "client" and "server software."
- It is partially coincident with centralized computing systems.
- The model serves as the foundation for server-based computing approaches.
- It has been implemented in systems like Amazon Alexa (launched in 2014).
- The concept has been widely adopted with evidence of it being present in 50 Wikipedia sitelinks.
- It has multiple aliases including "client-server relationship," "C/S," "Online Systems," and variations in different languages like "arquitectura cliente-servidor" (Spanish).

## FAQs
### Q: What is the main difference between client-server and peer-to-peer models?
A: The client-server model establishes a clear distinction between clients that request services and servers that provide them, while peer-to-peer models allow all connected devices to function as both clients and servers with no central authority.

### Q: How does the client-server architecture handle resources?
A: In the client-server model, servers manage and provide resources, data, and services to multiple clients, which only consume these resources and don't typically share them with other clients.

### Q: Is the client-server model still relevant in modern computing?
A: Yes, the client-server model remains fundamental to modern computing, forming the backbone of internet services, web applications, and cloud computing systems despite the rise of other architectures like peer-to-peer.

### Q: What systems commonly use the client-server model?
A: The client-server architecture is implemented in various systems including web applications, database management systems, email systems, virtual assistants like Amazon Alexa (launched in 2014), and many cloud computing platforms.

## Why It Matters
The client-server model revolutionized distributed computing by establishing clear boundaries and responsibilities between service requesters and providers. This architecture enabled the development of scalable applications where resources could be centrally managed while serving multiple clients efficiently. It forms the foundation of most modern internet services, from simple websites to complex cloud computing platforms. By separating concerns between clients and servers, this model improved security, simplified maintenance, and allowed for more efficient resource utilization in networked environments. Without this architectural pattern, many of today's digital services would not be feasible or practical to implement.

## Notable For
- Foundational architecture for most internet services and cloud computing platforms
- Provides clear separation of concerns between service requesters (clients) and providers (servers)
- Enabled centralized resource management while serving multiple users efficiently
- Forms the basis for server-based computing approaches across various industries
- Implemented in widely used systems like Amazon Alexa and other virtual assistant services

## Body
### Basic Structure
The client-server model is a distributed application structure where tasks are partitioned between service providers (servers) and service requesters (clients). This architecture is classified under both network architecture and software architecture categories.

### Core Components
The model consists of two primary software components:
- Client software: Makes requests to servers and receives responses
- Server software: Responds to client requests by providing services or resources

### Relationships and Classifications
- Is a subclass of both network architecture and software architecture
- Is opposite of peer-to-peer architecture
- Is partially coincident with centralized computing
- Is part of server-based computing class

### Usage and Applications
The client-server model serves as the foundation for many distributed applications, including:
- Web applications and services
- Database management systems
- Email systems
- Virtual assistants like Amazon Alexa (launched in 2014)
- Cloud computing services

### Identifiers and References
- Wikipedia title: "Client–server model"
- Wikidata ID: 12387
- UMLS CUI: C0029038
- Freebase ID: /m/01xct
- Medical Subject Headings (MeSH) descriptor ID: D009862 (Online Systems)

### International Presence
The concept has international presence with documentation in multiple languages including:
- English (Client–server model)
- Spanish (arquitectura cliente-servidor)
- Arabic (بنية نموذج طلب الخدمة)
- And others: af, ar, az, bg, ca, commons, cs, de, el

### Aliases and Alternative Names
The model is known by various names across different contexts:
- Client-server relationship
- C/S
- Online Systems
- Client–server architecture
- Client/server
- Application server-cliente (Spanish)
- And other variations in different languages

### Related Concepts
- Related to Amazon Alexa (a virtual assistant service implementing client-server architecture)
- Associated with the work of professionals like Steve Caravajal, a computer scientist and university teacher

### Visual Representations
The model is commonly illustrated with diagrams showing:
- The client-server relationship (available at https://commons.wikimedia.org/wiki/Special:FilePath/Client-Server_Model-en.svg)
- Arabic version (https://commons.wikimedia.org/wiki/Special:FilePath/Client-Server_Model-ar.svg)

## References

1. Freebase Data Dumps. 2013
2. UMLS 2023
3. Quora
4. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)