The DeLorean time machine is a fictional automobile-based time travel device featured in the Back to the Future franchise. In the feature film series, Dr. Emmett Brown builds a time machine based on an automobile; a DeLorean DMC-12, with the intent of gaining insights into history and the future but instead winds up using it to travel across over 130 years of Hill Valley history (from 1885 to unspecified points beyond 2015) with Marty McFly, both to change the past for the better and to undo the negative effects of time travel. One of the cars used in filming is currently on display at Universal Studios Hollywood.
The operation of the DeLorean time machine is consistent throughout all three films. The operator sits inside the DeLorean (except for the first time, when a remote control is used), and turns on the time circuits, activating a unit containing multiple fourteen- and seven-segment displays that show the destination (red), present (green), and last-departed (yellow) dates and times. After entering a target date, the operator accelerates the car to 88 miles per hour (141.6 km/h), which activates the flux capacitor. A m.p.h scanner shows how many miles the car has reached and it stops counting when it reaches 88. As it accelerates, several coils around the body of the car glow white (seen as blue in the movie). Surrounded by electrical current like coming from a Tesla coil, the whole car vanishes in a flash of white/blue light seconds later, leaving a pair of fire trails where the vehicle's tires will pass arriving at the destination time.
Observers outside the vehicle see an implosion of plasma as the vehicle disappears, while occupants within the vehicle see a quick flash of light and instantaneously arrive at the target time in the same spatial location (relative to the Earth) as when it departed. In the destination time, immediately before the car's arrival, three large and loud flashes issue forth from the point from which the car emerges from its time travel. After the trip, the exterior of the DeLorean is extremely cold, and frost forms from atmospheric moisture all over the car's body.
Source: Wikipedia (original)