App development is the process of creating software applications that run on a device—typically mobile devices like smartphones and tablets, or platforms like computers and smart TVs.

There are two major types of app development:

1. Mobile App Development
Platforms: Android (using Java/Kotlin), iOS (using Swift/Objective-C)

Tools: Android Studio, Xcode, Flutter, React Native

Examples: WhatsApp, Instagram, Uber

2. Web App Development
Runs on: Web browsers

Languages: HTML, CSS, JavaScript (with frameworks like React, Angular, or Vue.js)

Backend: PHP, Node.js, Python, etc.

Examples: Gmail, Facebook, Trello

Key Steps in App Development:
Planning – Understanding the idea and purpose of the app

Designing – Creating the UI/UX using wireframes and mockups

Development – Writing the actual code (frontend and backend)

Testing – Fixing bugs and ensuring smooth functionality

Deployment – Publishing to platforms like the App Store or Google Play

Maintenance – Updating and improving the app over time