Iron sights are basic aiming devices used on firearms, consisting of a front sight and a rear sight. They help shooters align their line of sight with the target, allowing for accurate aiming without the need for optical scopes. Typically made of metal, these sights are durable and reliable in various conditions. To use iron sights, a shooter looks through the rear sight and aligns it with the front sight while keeping the target in focus. This method is common in many types of firearms, including rifles, handguns, and shotguns, making it a fundamental skill for marksmanship.