What is Adblue diesel exhaust fluid?

Adblue is an additive used in many newer diesel cars and has lately made news for being in short supply. So what is it and what does it do?

PRO 99 AdBlue Diesel Exhaust Fluid 20L

Tata Adblue Diesel Exhaust Fluid, Packaging Size: 20 Liter Pail, Model Name/Number: TLLDEF20 at Rs 55/litre in Chennai

Diesel Exhaust Fluid DEF 1 Gallon (AdBlue) DEF003

MAK Adblue AUS32 Diesel Exhaust Fluid, 99.99%, Packaging Size: 26 Liter at Rs 1500/bucket in New Delhi

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Adblue Diesel Exhaust Fluid at Rs 760/litre in New Delhi

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Level Sensors for AdBlue/Diesel Exhaust Fluid

POWER ADBLUE (DEF) DIESEL EXHAUST FLUID - Amberolplus - Engine Oil & Lubricants, Motor Oil, Synthetic Oil, Diesel Oil

Order EuroBlue AdBlue® Diesel Exhaust Fluid (DEF)