The Business Category ensures that all sources and industry statistics are relevant to a particular account. You can enter more than one Business Category, but only the first will be used for setting visibility sources.
As you can see in the screenshot above, you can select sub-categories to fine-tune the Business Category. Most categories go only two levels deep. The advantage of selecting more specific categories is that listing sources will be better tailored to these categories, resulting in a better experience for the client.