The twisted superpotential of 3d N=2 theories

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We study the effective twisted superpotential of 3d N=2 gauge theories compactified on a circle. This is a rich object which encodes much of the protected information in these theories. We review its properties, and survey some applications, including the algebra of Wilson loops, computation of supersymmetric partition functions on S^1 bundles, and the reduction of 3d dualities to two dimensions.