What is the difference between gasoline@diesel engine?

Talking about fundamental aspects then both the engines have some similarities. Both Diesel and gasoline engines are internal combustion engine and transforms chemical energy into mechanical that intern is used to move the vehicle.  However both the engines can be distinguished as per their explosion process:In gasoline engine:•    Intake stroke: mixture of air and fuel take place.•    Compression stroke: Via piston’s upward motion, mixture (fuel & air) is compressed.•    Ignition stroke: the mixture is ignited via spark plug•    Exhaust stroke: piston goes up and pushes the exhaust.In diesel engine:•    Intake stroke: Piston goes down after intake valve opens.•    Compression Stroke: Air is compressed after piston goes up.•    Combustion stroke: Fuel is injected and piston goes down:•    Exhaust stroke: in this stroke piston pushes exhaust via its upward motion.

The basic working principle is same for the both engines. Both are four stroke engines. The difference lies in the combustion system. In gssoline engines, the gasoline is feeded into the cylinder through injection nozzle, and then compressed by the piston, and finally ignited by a spark plug. This spark plug gets the current from distributer. 

In diesel engines, there are no spark plugs. The fuel is injected into combustion chamber, then compressed by the piston in itscompression stroke. When air is compressed, its ttemperature rises up. This temperature rises to a sufficient level where diesel is ignited. This ignition of fuel finally follows the power stroke.