You see, the online marketplace is huge. Immensely huge. There are billions of websites on the internet. So how do you make sure that someone who wants to buy an umbrella finds your store, and not one of the thousands of others? That's where SEO comes in.
In fact, you can actually think of Google as a modern-day Yellow Pages. But with a key difference being that results are dynamic and ever-changing. Now instead of you having to look for customers, SEO brings customers to you. Imagine having your website appear at the top of Google when your potential customers search online for the products/services you offer.