Orbot is a free Android app that enables other apps to browse the internet more securely. Orbot uses Tor to encrypt Internet traffic and then hides it by routing through a series of nodes around the world.
Orbot is an Android app developed by The Guardian Project.
From the orbot homepage, "Orbot is a free proxy app that empowers other apps to use the internet more securely. Orbot uses Tor to encrypt your Internet traffic and then hides it by bouncing through a series of computers around the world."
A list of resources to learn more about Orbot:
Wikipedia page on Orbot.