Hey Guys , In my previous post we have seen how to pass value from Parent to Child. Now lets see how you can pass value from Child to parent. Lightning Event : There are 2 types events and they are ' COMPONENT ' and ' APPLICATION ' event. 1st we will see how COMPONENT event works and here we will reuse the same components which you created in previous blog. Think like this. There is a child component(ChildComp1_PC1) which updates some value and you need that updated value in the parent component(ParentComp1). You are gonna remember these steps, Step 1: Create an event Step 2: Register that event in component (in our scenario we will register in child comp). Step 3: When the event is fired, have a logic to capture that event. so first you will create an event and register that in a child component (cause it is the one who is going to fire in order to send some values to it's parent ) so registering the event