All physical objects, such as stars, books, people, animals, plants and the sea, are examples of matter. Matter is any physical object that occupies space and has mass.
Matter exists in three states: solids, liquids and gases. Some scientists also believe matter includes other states, such as plasma and Bose-Einstein.
Matter is not limited to living or animate objects. For example, both a camera and a dog are matter, since they take up space and have mass. Matter isn't limited to size either as both the sun and bacteria count as matter.
Matter also includes materials that make up something larger. For instance, a beach is matter, but the small grains of sand that make up the beach are considered matter as well. Matter can be things that people are able to see, such as the water and creatures in the ocean but can also be things that cannot be seen or heard, such as the various types of gases that can be found in the air like oxygen and nitrogen.
Matter can include things that don't exist as either a solid, liquid or gas. For example, fire is an example of matter, but it is considered to be plasma.