What's the difference between organic vs. paid results?

Organic search results are listings on search engine results pages that appear because of their relevance to the search terms, as opposed to their being advertisements. In contrast, non-organic search results may include pay per click advertising.

Organic paid: When a search engine returns its search results, it gives you two types: organic and paid. Organic search results are the Web page listings that most closely match the user's search query based on relevance. Also, called "natural" search results, ranking high in the organic results is what SEO is all about.

Paid results are basically advertisements: The Web site owners have paid to have their Web pages display for certain keywords, so these listings show up when someone runs a search query containing those keywords.