Apple's original Maps app debuted with the first iPhone in 2007 and pulled location data from Google. Apple brought Maps to the first iPad in 2010 as well. Then, in 2012, after deciding they could no longer maintain their relationship with Google, Apple built an all-new, Maps app for iOS 6. It lost transit directions and Street View, but gained turn-by-turn navigation and Fly Over. Apple pulled in data from several different sources, including TomTom, but the data aggregation, cleansing, and sanitizing wasn't well done, leaving Maps prone to misreporting locations and points of interest.
In 2013 Apple brought Maps to OS X Mavericks, including the ability to push directions from the Mac to iPhone. Maps now works on the iPhone, iPad, Mac, and Apple Watch, and keeps improving every day.