The difference between sculptures and statues is that a statue is a large sculpture of a person or animal and is made of stone or metal. A sculpture is made by carving stone or wood or sculpting clay and varies in size from very small to very large but mobile.
In terms of art, a sculpture is considered a piece of fine art and is a more creative endeavor than a statue because it can be a recreation of anything, including imaginary beings or objects. Statues are, by definition, replicas of people or animals and are not as open to creative influence. Sometimes, a statue's features are not based on any real person but look as though they are.
Statues are almost always life-size or larger. For example, the Lincoln Memorial and the Statue of Liberty are both large scale statues while the Walt Disney statue in Disneyland is the same height and size of a human. Sculptures do not have any dimension restrictions.
Sculptures are likely to be displayed in art exhibits or sold as unique pieces of art. Statues are often commissioned and are usually anchored in one spot for a particular purpose. It is rare that a statue is mobile, and is therefore not meant as an exhibition of art but rather a tribute or commemorative piece.