There are many ways to drill a hole in something. But the most common is drilling. Bit comes in many sizes, shapes , etc. In order to create holes bits are usually attached to a power drill to cut through the workpiece by rotation. You can drill soft materials with most any drill bit, but brittle materials require specially designed tools. Forstener bits, big diameter core bits and so on should be used with a drill press. But most of tools can be used with a hand power drills.
Coatings help prevent rust, lessen friction and wear. Zirconium nitride coating adds the strength and improve precision drilling because it decreases friction significantly. TiN (titanium) coating is adds corrosion resistance and helps to remove heat from the cutting edge. Titanium also is heat-resistant and has an excellent fatigue limit.
One major aspect of drill bit selection is the material makeup of the drill bit itself. Not all bits will work on all applications. Soft low carbon steel cannot cut hard metals due to their poor tempers, but they can cut wood. High carbon steels require less sharpening, and hold their effectiveness longer. They can cut both woods and metals. High Speed Steel (HSS) is a special type of carbon steel that can withstand high temperatures. Friction created by high speed turning can raise temperatures dramatically, but HSS can undergo these types of drillings. Tungsten carbide alloys are tough, but brittle and more expensive. Carbide bits are used to drill concrete and tough steel.
Conical point with a flat surface and linear chisel are used to improve cutting process, removing chips, and reducing thrust. In modern automated drilling metalworking machines multi-faceted drill points are widely used. They require 50% less thrust, and generate 60% less heat.
Step drill bits are one of the more popular tools for drilling in soft and (or) thin sheet metal. They work at a faster speed to make relatively clean holes. Step drills come with just one single drill bit with progressively sized grooves and ridges. So you just need one tool for a variety of jobs. The one thing that you should avoid using step drill bits on is wood because they are known to split the wood.