React's `useEffect` hook helps developers manage side effects in applications by providing a clean and predictable way to interact with external state. It takes two arguments: a callback function containing the side effect code, and an optional array of dependencies that determine when the effect is re-run. This simplifies codebase and makes it easier to reason about application behavior.
React's useState hook provides a simple way to manage component state without the need for complex class-based approaches or third-party libraries like Redux. It allows you to define and update state variables using a single function, making it easy to get started with state management.
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