Google Talk was fully discontinued on June 26, 2017.
After the 2013 Google I/O Keynote, Google Talk was replaced with Google Hangouts. This logo is still used during Hangouts on Air.
This logo was released coinciding with Android Lollipop's release.
2015-2020 (Text logo)
This logo was introduced with the new Google logo in 2015. Hangouts will shut down in 2020.