How are Actions defined in Redux?

ReactJS - Interview Questions

Actions in React must have a type property that indicates the type of ACTION being performed. They must be defined as a String constant and you can add more properties to it as well. In Redux, actions are created using the functions called Action Creators. Below is an example of Action and Action Creator:

function addTodo(text) {
       return {
                type: ADD_TODO,    
                 text    
    }
}