Attributes allows you to add a costum column to the results list. An example of this could be if the top 10 athletes qualifies for a specific race, and you want this shown on the results list.
To add an attribute, go to Event setup and Settings and The result list and then scroll down to View attribute on result page. Set it to Yes and name the attribute.
You can add the attribute to the results by using Upload and set values or manually entering the attribute for each athlete using Search / edit athletes and then editing the participant.
You can add up to 4 attributes. Attributes can also be added to the registration.