A web application is a software program that runs on a web server and is accessed via a web browser over the internet. It provides services and functionality through a user-friendly interface to users. Common examples include email services like Gmail, social media platforms like Facebook, and educational platforms like Durgasoft Videos.

Components of a Web Application:

1. Front-End (Client-Side):

   • This is what the user sees and interacts with. It's responsible for the visual part of the application (buttons, forms, images, text, etc.).
   • Technologies: HTML, CSS, JavaScript, frameworks like React, Angular, or Vue.js.
   • Example: When you log in to Facebook, the login form, buttons, and layout are all part of the front-end.

2. Back-End (Server-Side):

   • This is where the application's logic and database interactions take place. It processes user requests, handles data storage, and ensures everything works behind the scenes.
   • Technologies: Programming languages like Python (Django, Flask), Java, PHP, Node.js, and databases like MySQL, MongoDB, etc.
   • Example: When you log in to Gmail, the back-end verifies your credentials, retrieves your emails, and sends them to the front-end to display.

The interaction between these two components allows users to access and use web applications smoothly.

Static Response vs Dynamic Response

1. Static Response:

   • A static response refers to content that remains the same for all users, regardless of who they are or when they access it. It doesn’t change based on user input or other factors.
   • Example:
     • Login Page of Gmail: The structure and content of the login page remain the same for every user (e.g., the form fields for email and password).
     • Home Page of ICICI Bank: The general homepage of the bank’s website that contains information about services and products, which is the same for everyone.

2. Dynamic Response:

   • A dynamic response is content that changes based on user-specific data or other variables, such as time, user preferences, or interactions. Each user might see different content based on their actions or profile.
   • Example:
     • Inbox Page of Gmail: The emails displayed vary from user to user, showing each person their specific inbox content.
     • Balance Page of ICICI Bank: When a user logs in to check their bank balance, the page displays their personal account details and balance, which changes over time and is different for each user.

This distinction helps to categorize content based on whether it is consistent for all users or personalized to individual users or situations.