Example 1:
Your event includes a number of workshops on a topic A, topic B and topic C, and you have created three corresponding session categories and assigned the relevant sessions to them. These sessions can now be shown as groups of sessions for each of the different topics (A, B and C).
Example 2:
Your event includes a number of consultation slots on three different topics (A, B and C), and you have created three corresponding session categories and assigned the relevant slots (=sessions) to them. Guests will now be able to use filters in the session calendar to search for free slots on each of the three topics (A, B and C).