What is "freemium"

a. Offering basic services for free while charging a premium for advanced or special features. n. (context countable English) A product that is offered free of charge and supported by sales of a premium version.

Freemium is a pricing strategy by which a product or service (typically a digital offering or application such as software, media, games or web services) is provided free of charge, but money (premium) is charged for proprietary features, functionality, or virtual goods. The word "freemium" is a portmanteau neologism that was coined by Jarid Lukin in 2006.