In the most general form, an object in RLaB can be data or a function. It is even possible to construct an object that contains both data and functions - a fact that no doubt excites the hormones in the modern day object oriented programmer. We are going to discuss basic data types before looking at how data can be ``grouped'' together for some useful purpose. We will also work through some simple examples that manipulate data but first, what does RLaB regard as data?