Conversion Rate

Successful completion of a web-based task, as defined by whoever is tracking for the conversion. Typical conversions are things like signing up for a newsletter, the sale of a particular product, or clicking on an ad.

Cost per lead is a model wherein companies pay a third-party service to provide leads for their business. This may be on an ad hoc basis or in a subscription model, with varying rates for different volumes and types of leads.

Content that is specifically curated for the person receiving it. The use of tracking and analytical tools can give you information on user behavior that can allow for this level of personalized advertising and content.