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O/C ratio: The abbreviation for orders per click.

Offer: The term of the deal offered to an affiliate by a merchant. These can include commission based on a percentage of the sale, a flat fee paid for each impression, or click-though, something more exotic (like noncash incentives), or a combination of these. The details of a merchant's offer are typically provided either by the merchant or by the affiliate solutions provider representing the merchants after an affiliate has been approved to join the merchant's program.

Online contracting services: Allow businesses to post position for which they want to hire outside resources, and individuals can identify projects that best suit their interest, schedules and skills.

Open content: Information on pages assessable to any visitor to your Web site.

Opt-in mailing list: An electronic mailing list to which a viewer must actively choose to subscribe before receiving it. If offered a choice, the default is not to subscribe.

Opt-out mailing list: An electronic mailing list to which a viewer must unsubscribe to stop receipt. If offered a choice, the default is subscription. Considered a violation of Netiquette.

Outbound link: viewed from the target business site, a one-way link going to another site. Sometimes called an external link.