Advertising isn't just B2C, it's also B2B. The companies that make everything you buy (from the food you eat to the electrical wires you install in your walls) needs raw materials and machinery to produce anything. While there's trade shows and good ol' fashioned handshakes and whatnot, one of the main ways to sell B2B is just camp the top Google result spots by giving Google a lot of money to be the first result for the names of business inputs (or the names of your competitors, if you want to be cheeky).

When you hire a non-technical purchaser, when production line 13's full-body discombobulator breaks and the maintenance guy says "we need a new full-body discombobulator", the purchaser has no idea what a "full-body discombobulator" is or who makes it but they'll Google "full-body discombobulator" and they'll click [Buy Now] on whatever link shows up so that production line 13 can continue printing half a million bucks an hour.