Measures are calculations used in visualizations, typically represented on the y-axis of a bar chart or a column in a table. Measures are created from an expression composed of aggregation functions, such as Sum or Max, combined with one or several fields.
A measure must have a name, and may also be supplied with descriptive data such as description and tags.
You can, for example, create a bar chart to visualize the cost of each type, by adding the Product Type dimension to the chart, and the measure Cost, which is made from the expression Sum(Cost), that is the result of the calculation of the aggregation function Sum over the field Cost. The results are grouped by the Product Type dimension.