Categories, what are they supposed to mean?

I don't understand what 'Categories' are supposed to mean in the context of OS_Property.
Based on the sample data for example, what is the relevance of "Expert Advice" or "Home Construction" etc to someone who wants to buy/rent a property?

Can someone please explain?

Hi,
Categories, also referred to as property types, are the different categories of listing you want to display on your website. These categories will vary depending on your business needs. For example, many traditional real estate agents will require categories like "Residential", "Condominiums", "Waterfront", etc. Property management and rental agencies may require categories like "Apartments", "Timeshares", "Rooms for Rent", "Houses for Rent" and similar.
You can create as many categories and subcategories as you require for your needs
Dam