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?

PENBLUE (ADBLUE) DEF - Diesel Exhaust Fluid

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Factory Offer Adblue Diesel Exhaust Fluid Made for SCR - China

Custom DIN70070 Standard Ad Blue Urea Solution 32.5 Diesel Exhaust

Land Rover AdBlue® Diesel Exhaust Fluid

AdBlue Diesel Exhaust Fluid - OE Supplier G052910A2

Adblue Diesel Exhaust Fluid Solution Component of The Selective

Diesel Exhaust Fluid (Adblue) Market Size, Trends - 2030

GUS052910A3 - AdBlue DEF Fluid - 9.46 Liters

What is Adblue Diesel Exhaust Fluid (DEF) Solution of 32.5% Urea

Genuine Diesel Exhaust Fluid Adblue For VW SEAT Audi Skoda 10