Google announced that it is closing the door on Project Tango, the augmented reality platform it introduced in 2014 in effort to bring AR experiences to mobile devices, particularly smartphones. Though as the saying goes, when one door closes another one opens. That is the case here as well—in place of Tango, Google is going forward with ARCore,

Source: Hot Hardware – Google ARCore Takes Center Stage As Project Tango AR Platform Heads For Retirement