Wire Service in Lightning Web Component LWC

Lightning web components(LWC) use a reactive wire service, which is built on Lightning Data Service. Components use @wire in their JavaScript class to read data from one of the wire adapters in the lightning/ui*Api modules and also to call the apex controller server-side methods using wire services.

Reactive wire service supports reactive variables, which are prefixed with $. If a reactive variable changes, the wire service provisions(requests) new data.