Wikipedia
MyTracks is a GPS tracking application that runs on Android. The application uses a device's GPS to collect data, allowing real-time review of path, speed, distance, and elevation. Later, this data can be saved to Google Maps, Google Fusion Tables, or Google Docs and shared with Google+, Facebook, or Twitter. The application also allows a user to record annotations along the path, hear periodic voice announcements of progress, and sync with select third-party bio-metric sensors.
Google has announced that as of the 1st May 2016, MyTracks will be deprecated and no longer available in the Google Play Store,... Despite this announcement, the app is still active and available for downloading and installing in playstore. The app itself continues to work and is still available to sideload via APK repositories.
An in-app popup alerted users that MyTracks would stop working on April 30, 2016; Google has confirmed they will be investing in "other, more wide-reaching, mapping projects".