I started a very new job working with Autonomous Vehicles but don't know much about them.
self-driving car, robotic car) and unmanned ground vehicle is a vehicle that is capable of sensing its environment 
How does it actually work? Does a robot drive it?
Robotics is an interdisciplinary branch of engineering and science that includes mechanical engineering, electrical engineering, 
Does the car use sensors or camera's to see where its going?
It uses a digital single-lens reflex camera which  is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, 
Wow, how does it know where it is? does it use gps?
GPS navigation device
A GPS navigation device, GPS receiver, or simply GPS is a device that is capable of receiving information from GPS satellites and then to calculate the device's geographical position. Using suitable software, the device may display the position on a map, and it may offer directions. The Global Positioning System (GPS) is a global navigation satellite system (GNSS) made up of a network of a minimum of 24, but currently 30, satellites placed into orbit by the U.S. Department of Defense.
Self-driving car
A self-driving car, also known as an autonomous car, driverless car, or robotic car, is a vehicle that is capable of sensing its environment and moving safely with little or no human input.
Self-driving cars combine a variety of sensors to perceive their surroundings, such as radar, lidar, sonar, GPS, odometry and inertial measurement units. Advanced control systems interpret sensory information to identify appropriate navigation paths, as well as obstacles and relevant signage.
Long distance trucks