A slice is the part of the Redux state that belongs to one feature, together with the reducer logic and actions for that feature. A todos slice, for example, owns state.todos and the actions that change it.
You create a slice with createSlice, giving it a name, an initial state and an object of reducer functions. From those it generates:
the slice reducer, which you add to the store under the slice's key
an action creator for each reducer, and an action type such as 'todos/todoAdded'
So you no longer write action type constants, action creators and switch statements by hand. Each feature's Redux logic lives in one slice file, which keeps a large app organized by feature.
Rewriting in plainer words…
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