Open Rate

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.

The ratio of conversions for an ad campaign compared to the total number of views or interactions with that ad. A conversion can be defined in several different ways, but is often related to the sale of a product or service.

Software tools that are an end product in themselves, but help to facilitate other services or product creation. Examples include project management software and graphic design software.

Entire companies exist to provide software tools to individuals or businesses, as well as support for those products.