React Tutorial #1: What is React? Why React in 2026?
React is the most popular frontend library in the world. In the 2025 Stack Overflow Developer Survey, 39.5% of professional developers use React — making it the most widely used frontend framework for multiple years in a row. But what is React? And why should you learn it in 2026? This tutorial explains what React is, what problem it solves, and what is new in React 19. The Problem React Solves Imagine building a web page with vanilla JavaScript. You have a shopping cart. When the user adds an item, you need to: ...