What it means
The frontend runs in the browser or on the phone. It shows information, takes input and sends requests to the backend. It is built with HTML, CSS and JavaScript on the web, often with frameworks such as React or Next.js, and with native or cross-platform tools on mobile.
Good frontend work covers more than looks: speed, accessibility, clear forms and behavior on every screen size.
Why it matters for a business
The frontend is what customers judge. Slow pages, confusing forms and layouts that break on phones cost sign-ups and sales, even when the backend is excellent.
A business example
Things to watch
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Test on phones, not only desktops.
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Keep pages fast, especially on mobile networks.
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Check accessibility for keyboard and screen reader users.
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Keep forms short and error messages clear, since that is where most visitors give up.