Throughout this book, we will be developing a sample application to practice the gained knowledge and skills. In this section, you will get an introduction to the business domain, and more details will be added later throughout the book.

The domain that we are going to be working on is selling stuff online for private individuals. We will be building an application to publish classified ads and something that might be necessary to support this type of activity.

If you are not familiar with the terminology, think about a bunch of stuff you gave in your storage room or in the basement, which you would be delighted to remove. You can publish a small ad online and other people might buy things that you no longer need. You can also give stuff away for free. Examples of such services are websites such as eBay, Craigslist, Gumtree, Marktplaats (the Netherlands), and finn.no (Norway).