What is web application?

A web application (or web app) is a type of application software that operates through a web browser and is accessed over the internet. Here are the key characteristics and distinctions:

Definition

A web application is software that does not require installation on the user's device. Instead, it is stored on a remote server and accessed via a web browser245.

Functionality

Unlike static websites, which are primarily for information dissemination, web applications are designed for user interaction and functionality. They enable users to perform specific tasks such as filling out forms, managing data, making payments, or interacting with dynamic content124.

Architecture

Web applications typically follow a client-server model. Here’s how it works:

• The user interacts with the web application through a web browser.
• The browser sends requests to the web server.
• The web server forwards these requests to an application server, which processes the tasks.
• The application server interacts with a database if necessary and generates the results.
• The results are sent back to the web server and then delivered to the user's device135.

Components

A web application usually involves three tiers:

• Presentation: The web browser itself.
• Application: The server-side engine that processes requests (e.g., using technologies like PHP, Node.js, or Ruby on Rails).
• Storage: A database that stores and retrieves data3.

Examples

Common examples of web applications include:

• Webmail services (e.g., Gmail, Outlook)
• E-commerce sites (e.g., Amazon)
• Online banking systems
• Social media platforms (e.g., Facebook, Instagram)
• Workplace collaboration tools (e.g., Trello, Asana)145.

Security and Accessibility

Web applications do not require installation and can be accessed from any device with a web browser, making them highly accessible. However, they must be developed with proper security measures to protect user data, such as using HTTPS and robust encryption45.

In summary, web applications are interactive software programs that run on remote servers, accessed through web browsers, and are designed to perform a wide range of tasks and services.