1. Definition
1.1. A client-server application program or interactive web site which stored and run on a web server and delivered over the Internet through a web browser
2. Web Application Architecture
2.1. Web Browser
2.1.1. a software application used for retrieving, presenting and navigating information resources on the World Wide Web
2.2. Web Server
2.2.1. a computer program that processes requests (web pages) from clients via HTTP (Hypertext Transfer Protocol).
2.3. Database Server
2.3.1. a computer program that provides other computers or clients with the services related to accessing and retrieving data from a database
3. How Web Application Works?
3.1. 1. A web application consists of dynamic web page which is created by a script and can be changed each time it is viewed. 2. The changes in the page are occurred by processing the form data that is submitted by user or by displaying data that is retrieved from a database server.
4. Scripts : Server Side VS Client Side
4.1. Server side script:
4.1.1. 1. Written for the purpose to execute a special task. 2. Executed on the server to generate responses for clients.
4.2. Client side script:
4.2.1. 1. Programs that are executed at client side or web browser. 2. Can be prepared and implemented offline.
5. Software Component in Web Application
5.1. Web Browser
5.1.1. 1. Internet Explorer 2. Chrome 3. Firefox 4. Opera
5.2. Web Server
5.2.1. 1. Apache 2. IIS
5.3. Database Server
5.3.1. 1. MySQL 2. Oracle 3. DB2 4. MS Access
5.4. Server side language
5.4.1. 1. PHP 2. ASP 3. JSP 4. Python