Furniture is a noun that can be used to describe any movable objects that are to be used to help in any human activities. This can really refer to almost anything. Beds help with sleeping, tables with eating and chairs for sitting. Really any thing mobile in a home or office can be considered furniture, any thing used to hold objects or used for storage.
Furniture is not just a useful product but is also considered an art form by many people and can be used to decorate any living space. Above and beyond the functional and artistic uses many pieces are used in a symbolic or even religious manner. Furniture can be made from just about anything including but not limited to metal, plastic, and wood.
Now with all the fancy things you can pick up at your local department store you might not think that furniture has been an important part of human culture for a very very long time. Evidence of furnishing exists in ancient paintings from the neolithic period, in sculptures in Pompeii, and tombs including furniture have been excavated in Ghiordes, Egypt, modern day Turkey, and modern day Vietnam.