Quick definition · 2 min Coding term
Localhost
Localhost is a private web address that shows your app only on your own computer, so you can preview it before anyone else can.
Think of it like
A dress rehearsal in an empty theater. The show runs, but only you can see it.
Example
After the AI says “run the dev server,” it gives you a link like localhost:3000. That page lives on your machine alone.
Why it matters
It is the first link every AI coding tool hands you, and beginners panic when friends cannot open it. They cannot: it is local.
Where you’ll see it
your browserevery dev server
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