A brazier is like a small campfire that's used for keeping you warm or for cooking food. It's like a metal bowl or container that you can put wood, coal or other kind of fuel inside of, and then light it up to create a fire. The brazier can also come with a grill or a grate on top, which makes it perfect for cooking food like sausages or marshmallows.
Imagine you're outside on a cold night and your mommy and daddy set up a little bonfire for you. A brazier is just like that bonfire, but smaller and safer. It's also great for roasting marshmallows or hot dogs, just like when you go camping. You can sit around it and tell stories or play games with your family and friends, while staying warm and cozy.