What is the most common type of quality general purpose drill bit?

The most common type of general-purpose drill bit is the high-speed steel (HSS) twist drill bit. HSS drill bits are versatile and suitable for drilling through various materials, including wood, metal, and plastic. They are favored for their durability and ability to maintain sharpness, making them ideal for a wide range of applications. Additionally, many HSS bits come with a coating, such as titanium or cobalt, to further enhance their performance and lifespan.