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hi guys in today's video we'll be talking about observer design pattern now this is probably one of the most easiest design patterns and one of the most widely used ones in my life i've used it in three interviews now i guess you can imagine how many applications it has to give you some idea let me give you some examples to understand the concept properly now suppose you are logged in into multiple devices on an application now you could be checking your mail or you could be receiving messages on slack just that you are logged into multiple devices now it could be your laptop it could be your phone it could be your ipad anything okay now as soon as a message comes all of these devices have to be notified right notification comes in all of these devices how does that happen now this is a very common problem right consider any system whenever one change happens we have to say do some logging we have to take some action against it maybe we have to do some monitoring maybe we have to notify some other services so just on pieces of one data change so many things have to happen how does it happen another such example that we are actually going to use to see our code is group messaging all the people in the group are notified right how does that happen so yes all of these problems are solved by observer design pattern and by now i guess you have understood the problem whenever there is one data change happening and a lot of people have to be notified a lot of things have to be done to use observer design pattern some people might use different jargons but this is the main concept so some people might say that there is a publisher who is publishing some change and there are some subscribers who have subscribed to this change so whenever a publisher publishes some change all the subscribers are notified but in general this is the main concept right now there are things like these subscribers can subscribe or unsubscribe and all of these subscribers need to be notified but essentially the same thing is happening that there is one thing over here there are multiple things over here and all of these people have to be notified upon the change in this particular thing another jargon that people use is that this is a subject and there are observers that are observing the subject so whenever change happens in the subject observers are notified before we move ahead let me tell you about the sponsor of the video free level by an academy is now bringing relevant select a five-day event where you can access companies like ringify times network crypto and many more just by attempting a simple free test there are daily prices worth 30 000 and toppers get macbook iphone 13 and iwatch along with...