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all right so in our last video we looked at how we can use controllers to handle a request and send a response so if you are coming to this video with without looking at the older video so what we have done so far is installed nest js and we created a quiz module and we just created this controller which accepts a request on the slash url inside quiz and it responds back with a hard-coded array for now so we were basically understanding the routing and the routing structure and how the controllers will handle them but now we are sending some data right we are sending information from the application back to the client and we would want to understand how the separation of concerns can be done so obviously our application will never send such things to the client thereamp;#39;s no point of having an application which sends this kind of and hard coded data there will be stuff which will have some business logic so we will need a service the service is like the think tank it has all the b