Groups vs. Sets was something that confused me a little when starting off with Tableau. Groups seem pretty self-explanatory but sets got a little complex. Grouping in Tableau is grouping multiple members in a SINGLE dimension into a higher category and creating a set is grouping members from MULTI dimensions and/or condition into a dynamic or constant group. So sets are just a more complex and dynamic grouping.
Take a look at the video and dashboard below to get a more detailed explanation of Tableau’s groups and sets, with examples.