Ironmongery is a fancy word that means anything made out of metal that you might find in a building like a house or office. Have you ever opened a door or a window before? The things that help you open them, like handles, hinges, locks and keys, those are all examples of ironmongery.
Let's say you're holding a door handle, which is a kind of ironmongery. Do you notice the metal part you're holding is called a lever, and it turns to help you open the door? The lever is the most common kind of ironmongery.
Now imagine a cupboard door or a wardrobe. How do you keep it closed after you open it? You can use ironmongery, like a latch or a clasp to secure it closed.
Ironmongery is everywhere and comes in many different shapes and sizes. It's important because it makes buildings both look nicer and it helps everything stay secure and functional.