Signals are a reactive way to store and track state in an application. They return a getter and a setter, unlike non-reactive systems which only return a value and a setter. This allows for more efficient updates and prevents unnecessary re-renders in the UI. In contrast, React's useState() returns only the state value and lacks the subscription tracking and notification features of Signals. Overall, Signals provide a more efficient and reactive approach to state management in web frameworks.

1m read timeFrom builder.io
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