  We survey old and recent results dealing with the existence and properties of
solutions to the Choquard type equations $$
  -\Delta u + V(x)u = \bigl(|x|^{-(N-\alpha)} * |u|^p\bigr)|u|^{p - 2} u \qquad
\text{in $\mathbb{R}^N$}, $$ and some of its variants and extensions.
