React Native
Like building two houses with the same floor plan, it lets one codebase create apps for both iOS and Android.
Picture drawing one blueprint, then building on two lots. React Native lets you write app screens in JavaScript and render native mobile interfaces on iOS and Android from the same project.
It matters because one team can ship features to both stores together, share most code, and still access device features like the camera or push notifications when needed.
In practice you write components, which are reusable blocks that describe a screen, add styles to control layout and colors, use a navigation library to move between screens, and use over‑the‑air updates to fix issues without a full store release.