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Web Development
JavaScript is the programming language of the web. It makes pages interactive, from menus and forms to full web applications.
It runs in every browser and, through Node.js, on servers too. Frameworks such as React and Next.js are built on it.
JavaScript is powerful but costs performance. Large amounts of it delay how quickly a page responds, which is why modern sites send as little as possible to the browser.
Example
When a visitor opens the menu on a phone, JavaScript shows the dropdown and locks the page from scrolling behind it.
Why it matters
It is the most in-demand web skill, and managing it well is central to fast pages and good Core Web Vitals.
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Web Development
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