SEO is the strategy used to list sites on the main search engine through natural or organic rankings.
- There is no cost accrued when clicked on the listing like there is in paid search.
- Paid Search, or Pay-per-click (PPC) or Cost-per-click (CPC) is a process of gaining website traffic by bidding on keywords to have your ads shown in top placements or position on SERPs. Each time an ad is clicked on it costs a certain amount, but will never go above the maximum CPC (max. amount you are willing to pay when someone clicks on your ad)