Applications of Web Programming

Interactive website/web pages

Interactive websites use client-side and server-side scripting to dynamically update content and respond to user actions.

• Commonly built with HTML, CSS, JavaScript, and front end frameworks like React or Vue.js
• AJAX allows data to be fetched from the server without reloading page
• Backend (Node.js, Flask, PHP, Django) process requests, manage databases, etc

Example: a social media platform that updates posts in real time without needing to refresh the page.

Scalability and data management

Scalability refers to the ability of a system to handle increased traffic and data load, without performance degradation.

Static vs dynamic

In static delivery, the webpage is pre generated and stored on a server or CDN.

• Server just sends the pre rendered file to the browser
• Example: a blog on a simple portfolio site, where all pages are pre built and remain unchanged when a visitor accesses them

In dynamic delivery, the server generates the webpage in response to the user's request. The content depends on external data.

E-commerce

Online platforms that enable buying and selling of goods and services.

• Requires secure payment processing, shopping carts and user authentication
• Secure payment gateways like PayPal, Stripe, and Apple Pay

Example: Amazon and eBay allow customers to purchase items using encrypted transactions.

Progressive web apps (PWAs)

Web applications that function like native mobile/desktop apps.

• Have offline access, push notifications and responsive design
• Use service workers to cache data
• Installable on multiple platforms using the same code

Example: Twitter Lite is a PWA that runs efficiently on mobile browsers with app-like functionality.