React is Component based library and thus you need a away to allow communication between these Components. Sure you can pass props from Component to Component, but once number of your Components grows, it will hard to to get whole picture of properties that are used in your React application, let alone modify them.
Enter Redux. At the heart of it is a store that combines all of your properties in one place. It's like a real store - you don't have to run around all manufacturers (Components) to get an item you want (Property), you just go to the store and choose which item (Property) you want to get. You don't drive to DeWalt to buy their drill, you drive to Home Depot to buy it, and while there pick up other things as well.
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