What does it mean to "tap" a hole?

Tapping a hole refers specifically to the process of cutting internal threads within the hole using a tap tool. This is a crucial step in preparing a hole for the insertion of a screw or bolt that has corresponding external threads. By creating these internal threads, the tap ensures that the fastener can be securely fastened within the material, allowing for effective assembly and stability of components. The use of a tap tool allows for precise thread formation, which is essential for proper fitting and strength in mechanical applications. This process is fundamental in various manufacturing and repair tasks, making it an important skill in the realm of machining and metalworking.