Drilling is a machining operation to make holes in a workpiece. Drill bit is the specialized cutting tool for this job. Twist Drill bits come in various sizes, types, and materials. And they have a complex geometry.

There are 3 main parts: Shank, Body and Drill point.
The geometry of the drill point is further defined by various angles, which have described in detail using a 3D model available in GrabCAD.

Credits :
Music : https://www.youtube.com/watch/uAW3L
Videos Used :
Drill Terminology :    • Drill Terminology  
   / gotmachinery  
Drill Bit Construction :   • Video  
Drilling Machine : Production Engg Lab, NIT Durgapur, WB IN