React is a JavaScript library for building the parts of a website people see and use. It lets developers split a page into reusable pieces, such as a search box, a button, or a product card.
When information changes, React can update the relevant part of the screen. Imagine changing one notice on a board without rebuilding the whole board.
React helps organize interactive interfaces, but it does not decide how a product should look or what features it needs. Developers still choose the design and other tools needed to make the complete website work.