Nails have different shapes due to their various uses. The most common nails are called "wire nails". Other common nail names include pins, thumbnails or bent head nails. Nails are widely used in many scenarios. Rivets for general aircraft carriers are expensive, while ordinary nails are cheap.

Nails are pointed hard metals (usually steel) used to fix wood and other objects. Hammers drive nails into objects. Recently, there are also electric nail guns and gas nail guns. The reason why a nail can stabilize an object is that it hooks on it by its own deformation and depends on friction. Nails are one of the most common things in decoration. Iron nails are also called iron nails, and steel nails are also called steel nails.