Machines are devices that perform multiple activities using some form of energy. May it be manual or mechanical energy, machines are able to work with it on land, in water, or in air. These devices do have some parts that perform or assist in performing a particular type of work. How Machines Work presents the series of multiple volumes on the know-how of different machines that children see around them. A young one will definitely like to have these beautiful multicoloured pictorial books in his/her bookshelf!