Every click has to land somewhere

And where it lands is post-click marketing. Yes, if you are doing online marketing you are doing post-click marketing. You may just not call it that.

Just like an airplane pilot, you need to be in control your landings.

If you are driving social and organic traffic you might have limited control over how people find you, what they click and where they land. But for your traffic from sources like PPC, affiliate, email, and display you have total control over both your ad messages and where people land when they click those ad messages. It’s where you send your ad clicks that will make all the difference to your campaign performance.