Action ↔ object with type & payload info to pass Reducer to update state

type

to describe Action to change state

payload

to attach data to change state

References

1. Dispatch Function ↔ fn to Dispatch Action to Reducer

2. Reduce ↔ (process) to generate new state based on current state & some Action payload

3. type ↔ to describe Action to change state

4. Reducer ↔ function to Reduce to new state value from Action input

5. Dispatch ↔ redux fn to send Action object to Reducer

6. Root Reducer ↔ redux fn to compute new state from old state & Action data