O
- Organic Listings
- Listings that search engines do not sell (unlike paid listings). Instead, sites appear solely because a search engine has deemed it editorially important for them to be included, regardless of payment. Paid inclusion content is also often considered "organic" even though it is paid for. This is because that content usually appears intermixed with unpaid organic results.
- Outbound Links
- They are links on a particular Web page leading to other Web pages, whether they are within the same Web site or other Web sites.