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So we have implemented the Unit of Work pattern in our previous video and understood why it is important to use it with the repository pattern. In this video we will see what is DTO (Data transfer objects) and why we need to use it at all. So if we look at our current architecture, we are directly exposing the domain entities to the client at present. See, this GetCities method is directly returning the city entity. And this AddCity method as well directly saves the city entity that we are receiving from the client. Means our API client is able to send and receive the objects that directly map to our database tables. Whats wrong with this approach, well there are many issues with this approach. Let me show you a few of those with a practical example next. So at present our city entity contains only two properties, id and name, and this is what we want our client to receive and send. But later someday for example we have decided to add two more properties to this entity. One is to sto