Imagine you have multiple boxes and in each box, you can store one item. Before you can store anything, you need to decide what type of item can be stored in each box. But now you have so many boxes, you don’t remember what is in each one. You decide to give each box a unique label. This will help you keep track of what each one contains. The labels act as identifiers, giving each box a unique identity.

Netflix is the biggest video streaming platform in the world, offering movies, seasons, biographies, reality shows, and more. Their video repository is growing significantly. So the engineering team at Netflix keeps trying to find better ways to display content to their consumers.

The scenario and the problems discussed in this chapter also relate to any content displaying functionality and how we can improve it.