A 'Motte' was a mound or hill of earth that the castle stood on, a 'Bailey' was an outer protection ring around the motte, built with wood or stone
Motte and Bailey castles were intended to be quick to build and hard to attack, they had several rings of defences which were designed to benefit the defenders massively
Often Saxon peoples' homes were knocked down so that the castle could be built – the local peasants were forced to help build the new castles (taking between 4 and 9 months)
The Anglo-Saxon chronicle of 1067: 'The Normans…built castles far and wide throughout the land, oppressing the unhappy people, and things went ever from bad to worse.'