Client–server model

A network architecture in which clients request services or resources from servers, which process requests and return responses. Clients and servers may be software roles running on separate or shared machines.

Hypertext Transfer Protocol: An application-layer protocol for exchanging requests and responses between web clients and servers. Web browsers use its request–response pattern to retrieve resources from web servers.
Client (computing): A program or device that requests services or resources from another program or device. It initiates the requests that define the client role.
Web application: An application accessed through a web browser or another networked client. Its interface runs at the client while server components handle shared data and logic.
Three-tier architecture: A software architecture that separates presentation, application processing, and data management into three tiers. It organizes a client–server system into specialized presentation, logic, and data roles.
Domain Name System: A distributed naming system that maps domain names to records such as IP addresses. Clients commonly use it to locate the server named in a request.
Server (computing): A program or computer that provides services or resources to clients over a network. It receives and answers requests in the architecture.
Database server: A server program that stores, retrieves, and manages data for client applications. It serves database requests from application clients or other servers.
Thin client: A client device or program that relies heavily on a server for processing and storage. It pushes more work from the client role onto server infrastructure.
Transmission Control Protocol: A transport protocol that provides ordered, reliable delivery of a byte stream between network endpoints. It carries many client–server exchanges while handling retransmission and ordering.
Computer network: A set of interconnected computing devices that exchange data using communication protocols. Client and server roles depend on network communication between endpoints.

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