| palindromic seo | Noun phrase. The practice of optimizing a Web page for palindromic twins (q.v.) or palindromic expressions. (Cf. Palindromic SEO makes SEO Palindromic.) |
| open websearch | Noun phrase. See Bright Websearch. |
| open directory project | (ODP) See DMOZ. One of the oldest and most comprehensive human-reviewed directories on the web. |
| google keyword tool | Googles free keyword research tool. The tool provides search volume estimates, competition, and related keyword recommendations for a specific keyword and others similar to it. |
| opt-out | Marketing initiatives in which a user chooses not to participate. |
