  In this short review we present the key definitions, ideas and techniques
involved in the study of symmetry resolved entanglement measures, with a focus
on the symmetry resolved entanglement entropy. In order to be able to define
such entanglement measures, it is essential that the theory under study possess
an internal symmetry. Then, symmetry resolved entanglement measures quantify
the contribution to a particular entanglement measure that can be associated to
a chosen symmetry sector. Our review focuses on conformal
(gapless/massless/critical) and integrable (gapped/massive) quantum field
theories, where the leading computational technique employs symmetry fields
known as (composite) branch point twist fields.
