Vacuum cleaners are electrical devices that use suction to collect dust and small particles from floors and surfaces. There are different types, including dry vacuum cleaners for loose dust, wet vacuum cleaners for wet floors, and models that can be used on both dry and wet surfaces. Vacuum cleaners have various tools and attachments like brushes and upholstery tools. Proper use involves checking for safe operation, lifting by the handle, emptying the dust bag regularly, and storing safely after use.