  Floquet engineering is the concept of tailoring a system by a periodic drive.
It has been very successful in opening new classes of Hamiltonians to the study
with ultracold atoms in optical lattices, such as artificial gauge fields,
topological band structures and density-dependent tunneling. Furthermore,
driven systems provide new physics without static counterpart such as anomalous
Floquet topological insulators. In this review article, we provide an overview
of the exciting developments in the field and discuss the current challenges
and perspectives.
