Vertical and horizontal are marketing terms.

A vertical is a solution for a particular industry or company type.

A horizontal solution relates across business types, although there might may be customizations for a particular industry.

Do you need to allow customers to book appointments on-line?  more
Common usages are for dentists, massage therapists, consultants..

Do you own a restaurant?  Do you want to increase your take-out business? more


Do you participate in a charity and do fund raising? more