Orbot Features:

• Safe to use: Orbot is the most reliable way to use the Internet on Android. It bounces your encrypted traffic through computers around the world, instead of connecting directly like VPNs and proxies. Although this process takes a little longer, it proves the most robust privacy and identity protection.
• Private web surfing: Orfox helps to access the website in the most anonymous way even the site is blocked, monitored, or on the hidden web.
• Private chat message: Users can chat confidentially with anyone anywhere for free by Chatsecure with Orbot.
• Privacy for apps: Any installed application can use Tor if it has a proxy feature, users can set it by themselves.
• Privacy for everyone: Tor helps you confidentially research a competitor, circumvent a firewall to watch sports at work, or get around the Facebook block at school.

More:

Orbot is developed by The Guardian Project. They continuously keep upgrading their software to combat the latest threats and eliminate bugs. For more introductory guide, you can go to https://securityinabox.org.