A simple definition of a web application is a software program which the user accesses over a network with a web browser.

Most people are familiar with programs that are installed directly on their computers such as Microsoft Office Word.  Program files are stored directly on the computer’s hard drive.  For the program to properly function, a computer needs to meet certain requirements such as operating system compatibility, RAM and hard drive, memory, or processing speed. 

Web applications require only a web browser such as Internet Explorer, enabling the users to access the application from almost any computer.  Some web applications require the use of a specific web browser and most require browser add-ins and browser languages such as JAVA.  Data can be shared with everyone in an organization regardless of location.  It is important to keep in mind, response time of the application is dependent on the connection speed (For Internet: dial-up, DSL, Fiber Optics, etc). 

How does a Web Application Work?

To understand how a web application works see the below diagram.