At this point in the course, you have learned the basics of the DAX language. You know how to create calculated columns and measures, and you have a good understanding of common functions used in DAX. With the knowledge you have gained so far, you can already create many insightful reports, but you will need to learn evaluation contexts in order to create more elaborate and complex reports. You will see that an evaluation context is made of both a filter context and a row context. Evaluation contexts are the basis for all advanced features in DAX.
A word of a warning: the concept of an evaluation context is an easy one, and you will learn and understand it soon. Nevertheless, you need to thoroughly understand several subtle considerations and details. Otherwise, you are likely to feel lost at a certain point on your DAX learning path.
Evaluation contexts play an important role with the use of the CALCULATE function, which you will meet in the next module.
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