Payload in Redux Toolkit

Can someone explain me what is payload in redux-toolkit?

Where does this value came from?

import { createSlice, PayloadAction } from ‘@reduxjs/toolkit’

export interface CounterState {
value: number
}

const initialState: CounterState = {
value: 0,
}

export const counterSlice = createSlice({
  name: 'counter',
  initialState,
  reducers: {
    increment: (state) => {
      state.value += 1
    },
    decrement: (state) => {
      state.value -= 1
    },
    incrementByAmount: (state, action: PayloadAction<number>) => {
      state.value += action.payload
    },
  },
})

export const { increment, decrement, incrementByAmount } = counterSlice.actions

export default counterSlice.reducer