What does this TDI means

We all have seen some of the car has written TDI on their back.
What does this TDI means?

Here you know-

Turbocharged Direct Injection(TDI):

Turbocharged Direct Injection or TDI is a design of turbodiesel engines, which feature turbocharging and cylinder-direct fuel injection,developed and produced by the Volkswagen Group.

TDI engine uses direct injection,where a fuel injector sprays atomized fuel directly into the main combustion chamber of each cylinder,rather than the pre-combustion chamber prevalent in older diesels which used indirect injection. The engine also uses forced induction by way of a turbocharger to increase the amount of air which is able to enter the engine cylinders,and most TDI engines also feature an intercooler to lower the temperature (and therefore increase the density) of the 'charged', or compressed air from the turbo, thereby increasing the amount of fuel that can be injected and combusted.

Cars using this technology includes Audi R10 TDI,Volkswagen Polo 1.6 TDI,Tata Indigo eCS LX TDI ,Tata Indica Vista Terra TDI ,Audi Q7 3.0 TDI and many more.