Nut and bolt assemblies are fundamental components used to join two or more objects together securely. The bolt is a threaded cylindrical rod with a head at one end, while the nut is a small, typically hexagonal piece with internal threading. During assembly, the bolt is inserted through holes in the objects being joined, and the nut is tightened onto the threaded end of the bolt. As the nut is turned, it engages with the threads on the bolt, creating a clamping force that holds the objects firmly together.