Microsoft is planning to add categories to Yammer groups.

During the creation process of a Yammer group, you will eventually be able to add a category to your group. It’s not clear as to what categories are going to be available as there are two different articles from Microsoft showing two different types of categories. And it’s not clear yet as how you will be able to manage the categories.

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The categories will make it easier to find the type of groups you are looking for.

The category will be shown in the left navigation bar and on the group header. (see image below)

For more information see these two articles :