A vacuum cleaner is a machine that sucks up dirt, dust, and debris from floors and other surfaces using powerful air suction. Inside the machine, a motor spins a fan that creates a partial vacuum (an area of low air pressure), and air rushes in to fill that space, carrying dirt along with it. The dirt gets trapped in a bag or container while the air passes through filters and exits the machine.

The first practical vacuum cleaners appeared in the early 1900s and were so large they had to be pulled by horses and parked outside homes while workers fed hoses through windows. Modern vacuum cleaners are much smaller and easier to use. Some have rotating brushes that help loosen dirt from carpets, while others are designed for hardwood floors or for reaching tight spaces.

People sometimes call vacuum cleaners just vacuums for short, and we use vacuum as a verb too: you might vacuum the living room before guests arrive. Some newer vacuum cleaners are robots that automatically clean floors on their own, navigating around furniture while you do other things. Despite all the technological improvements over the years, the basic principle remains the same: using suction to pull dirt into a container where it can't escape.