How React renders UI

What this means

Rendering means turning your component description into something visible on the screen. In React, you describe what the UI should look like for the current data, and React updates the browser.

In beginner terms, this topic answers one practical question: "What should I write, and why does React care about it?" Do not try to memorize the syntax first. First understand the idea, then connect the syntax to that idea.

Why it matters

This is different from manually finding HTML elements and changing them one by one. React lets you think in terms of data and the final screen you want.

When you build real React screens, this idea helps you decide where data should live, what the user should see, and what should happen after an interaction. That is why this lesson is part of the main path instead of being an optional detail.

Step by step

1. Notice the UI problem this topic solves. 2. Look at the smallest possible example. 3. Change one value and predict what should appear. 4. Run the example and compare the result with your prediction. 5. Use the practice task before moving on.

Small example

const name = "Ada";

function Greeting() {
  return <p>Hello, {name}</p>;
}

Common mistake

Do not manually edit the DOM for normal UI changes. If data changes, let React render the new UI from that data.

Practice task

Change a value named name and write what the greeting should show after React renders again.

Remember this

React turns data into UI.