You wrote your website all by yourself and you’re really chuffed with it.
Your Granny said, “Wonderful darling,” but you’re not convinced anyone else has seen it.
Meanwhile...
...in an office just up the road, Mr Perfect-Customer is online. He’s in a hurry. He has 5 minutes, between meetings and he’s searching for a birthday present for his wife.
Search Engine Optimisation,
or SEO, is about getting your website in front of Mr P-C.