filter

A filter is a device that separates things from each other. It can be used to remove dirt, germs, or other unwanted substances from water, air, or other materials.

There are many different types of filters, but they all work in the same basic way. A filter has a special material that allows some things to pass through it, but not others. For example, a filter that is used to remove dirt from water might have tiny holes that allow water to pass through, but not dirt particles.

Filters are used in many different places, including homes, businesses, and hospitals. They are also used in many different industries, such as the water treatment industry and the food processing industry.

The coffee maker has a filter.