  We construct a three dimensional deconfinement method which enables us to
find new three-dimensional dualities and we apply various techniques developed
in four dimensional supersymmetric gauge theories, such as the product gauge
groups and Seiberg-Witten curves to the three dimensional $\mathcal{N}=2$
supersymmetric gauge theories. Dual descriptions of three dimensional
$\mathcal{N}=2$ supersymmetric gauge theories which involve two-index matters,
for example, adjoint, symmetric, and anti-symmetric matters without
superpotentials can be obtained. These matters are described in terms of
s-confining phases of the supersymmetric gauge theories.
