Exactly what is a carbide burr
Carbide burrs are tools used for deburring, cutting, shaping, grinding, and chamfering hard materials. Different cuts of carbide burrs will probably be most suitable for many materials.

Carbide burrs are utilized in air tools like die grinders, pneumatic rotary tools and high-speed engravers, Micro Motors, Pendant Drills, Flexible Shafts, and hobby rotary tools.

Why do you use Carbide burrs over HHS(high-speed steel)?
Carbide comes with a Extremely high heat tolerance allowing these to operate at higher speeds than similar HSS cutters, whilst still being maintain their cutting edges. High-speed steel(HSS) burrs will begin to soften at higher temperatures while carbide Maintains hardness even under compression and has Longer working life and it is a more sensible choice for very long term performance as a result of higher wear resistance.

Single-Cut vs Double-Cut
Single cut Burrs are suitable for General Purpose. It’ll give good material removal and smooth workpiece finishes.

Single cut can be used with stainless steel, hardened steel, copper, cast iron, and ferrous metals and may remove material quickly using a smooth finish. Can be used for Deburring, cleaning, milling, material removal or creating long chips

Double cut Burrs accommodate rapid stock removal in harder materials and tougher applications. The designs reduces pulling action, allowing better operator control, and reduces chips

Double cut burrs are widely-used on ferrous and non-ferrous metals, aluminium, soft steel and for all non-metal materials for example stone, plastics, hardwood, and ceramic. This cut has more cutting edges and will remove material faster.

Double-cut leaves a smoother finish than single-cut on account of producing smaller chips as they cut away the material. Use double-cut for medium-light stock removal, deburring, fine finishing, cleaning, smooth finishes, and creating smaller chips. Double cut carbide burrs would be the most widely used and work for most applications.
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