What is the difference between motte and bailey and stone keep castles?

Motte and Bailey Castles are created on a raised mound which is either natural in formation or built. At the top perimeter of the mound a wooden post fence is built and within this enclosure there is usually a watch tower built. The design probably dates back as far as the neolithic period when hill forts were constructed to protect towns These type of castles are temporary in nature unlike the stone keep castle which as its name implies is made of more permanent materials and is surrounded by a stone wall.

Later versions of stone walled castles employed such structures as gatehouses, moats keeps and watchtowers, including the grander ones having both inner and outer courtyards.

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