  We study the structure and properties of free skew Boolean algebras. For
finite generating sets, these free algebras are finite and we give their
representation as a product of primitive algebras and provide formulas for
calculating their cardinality. We also characterize atomic elements and central
elements and calculate the number of such elements. These results are used to
study minimal generating sets of finite skew Boolean algebras. We also prove
that the center of the free infinitely generated algebra is trivial and show
that all free algebras have intersections.
