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Canister vacuum cleaner for home use. A vacuum cleaner, also known as a hoover (a genericized trademark) or sweeper and commonly referred to simply as a vacuum, is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from floors. — “Vacuum cleaner - Wikipedia, the free encyclopedia”, en.wikipedia.org
A perfect vacuum would be one with no particles in it at all, which is impossible to achieve in practice. The Latin term in vacuo is also used to describe an object as being in what would otherwise be a vacuum. — “Vacuum - Wikipedia, the free encyclopedia”, en.wikipedia.org
The Roomba is an autonomous robotic vacuum cleaner sold by iRobot. Under normal operating conditions, it is able to navigate a living space and its obstacles while vacuuming the floor. The Roomba was introduced in 2002; as of January 2008[update], over 2.5 million units have been sold. — “Roomba - Wikipedia, the free encyclopedia”, en.wikipedia.org