Many apps require an agreement to Terms of Service before using them Terms of Service can be many pages long and often written in legal language that the average person would find difficult to understand. With this business model, information is collected about the individual as he or she uses the app and its associated services This information can then be used for targeted marketing either direct by the company or sold to other for marketing or product development It is important to be aware that with this business model the app and service provided are free to the individual, but privacy as not assured How much the vendor can understand about an individual directly drives its profit.