The React Context API is a way to share values across the component tree without the need to pass props down through every level of the tree. It allows you to avoid prop drilling, which is the process of passing props down through multiple levels of the component tree just to get to a deeply nested component that needs the data.

How it works?

• Create a context object: The first step is to create a context object using React.createContext(). This function returns an object with two components: Provider and Consumer.

• Provide the context value: The Provider component is used to provide the context value to the component tree. It takes a value prop, which is the value that you want to share across the component tree. You can wrap any part of the component tree with a Provider component to make the value available to all the components within it.

• Consume the context value: The Consumer component is used to consume the context value. It works by rendering its children as a function and passing the context value as an argument. You can use the Consumer component anywhere within the component tree to access the context value.

Here's an example of how you can use the React Context API to pass a theme value down the component tree:

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In this example, the ThemeTogglerButton component is able to consume the theme and toggleTheme values without having to pass them down as props through every level of the component tree.