Server Architecture Explained: Types of Servers, Client Requests, and Host Information

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🖥️ Server

A server is a software application that receives requests from clients and responds with existing resources available on the server.
A server does not create new resources dynamically for every request; instead, it processes client requests and provides access to existing resources stored on it.

🧩 Types of Servers

Servers can be classified into three main types:

🔹 1. Database Server

Used to run database applications
Stores and manages data
Resources include:
  • Databases
  • Tables
  • Columns
  • Records (data)
📌 Examples: MySQL, Oracle, PostgreSQL

🔹 2. Web Server

Used to run web applications
Handles HTTP requests
Serves static content like:
  • HTML
  • CSS
  • JavaScript
  • Images
📌 Examples: Apache HTTP Server, Nginx

🔹 3. Application Server

  • Used to run business logic of web applications
  • Handles dynamic content
  • Acts as a bridge between web server and database server
📌 Examples: Apache Tomcat, JBoss, WebLogic

👤 Client

A client is a lightweight web application or software used to send requests to a server.
A client can connect to:
  • Local server
  • Remote server
The client sends requests using HTTP methods such as:
  • GET
  • POST
📌 The POST method is commonly used to send data from client to server.

🌐 Host Information

To communicate with a server, the client must provide host information, which includes:
  • IP Address of the server
  • Port Number of the server
  • Username
  • Password
This information allows secure and accurate communication between the client and the server.

⭐ Key Points

  • Server responds to client requests
  • Resources already exist on the server
  • Client-server communication uses HTTP
  • Host information is mandatory for connectivity

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