Before we delve into the examples of RxJava operators and their respective marble diagrams, it is necessary to learn the basic elements of these diagrams.

In this chapter, we will see how the elements and operators are represented in the documentation, as well as how the termination symbols are represented.

To do this, we will take a great introductory example from the reactivex.io website, and we will go through each of its elements.

Finally, we will see that we can use tools such as RxMarbles to make the learning process easier by doing interactive examples.