Bottom navigation has been added to Google's Material Design guidelines, meaning you'll soon begin seeing it beyond just Google+ and Google Photos.

As WABetaInfo notes, the redesigned bottom bar also looks similar to the one on the iOS version of WhatsApp, making the experience consistent for those who switch from Android to iOS and vice versa.

Android apps could soon start looking more like iOS ones, with Google introducing 'bottom-bar navigation' to its Material Design specs for smartphone displays. Bottom-bar navigation has appeared ...

On individual Wikipedia articles the bottom links shift to a bookmark icon, share button, translate button, quick search, and an activator for the slide-out menu.

Google Chat is getting a new bottom navigation bar with four tabs on Android and iOS. A similar redesign recently rolled out on the web.