Apple is planning to launch an ad exchange, according to an anonymous advertising executive who spoke to Business Insider. The site says it heard from "one of the biggest players in online advertising", but could not confirm it -- BI said it talked to other sources who said they had heard nothing about it. An ad exchange is an online sales platform that allows advertisers to target users through a variety of mechanisms. An Apple exchange could theoretically target particular Apple users based on their location, type of device, buying habits, what apps they own and more. Apple holds a ton of data about the buying habits of its customers, making an Apple ad exchange a potential gold mine for advertisers.