Handlebars are the curved metal bars at the front of a bicycle or motorcycle that you hold onto to steer.

When you turn the handlebars left or right, the front wheel turns with them, letting you control where you go. Different bikes have different styles of handlebars. Racing bikes often have drop handlebars that curve downward, letting riders lean forward for speed. Mountain bikes usually have straight or slightly curved handlebars that give riders better control on bumpy trails. The handlebars on a motorcycle work the same way, though they also have controls for the throttle and brakes built right in.

The word can also describe a style of mustache that curves upward at the ends, resembling old-fashioned bicycle handlebars. This distinctive look was popular in the late 1800s and early 1900s.

Handlebars might seem simple, but they're crucial. Without them, steering a bike would be nearly impossible. They give you leverage and control, turning small movements of your hands into precise changes in direction.