Without a database used on a website, it would be hard to keep the information provided to the page stored. A database is an essential tool used in nearly all online websites, except for a few simple HTML pages with data copied across all pages.
Businesses also use databases to store their customer's data, and without the database, they would have to do it old school by printing out the information and storing it in a file locker.
Databases have made life easier for web admins to store large amounts of data from their visitors and for big business.