Communion under both kinds

Communion under both kinds is the reception under both "species" (i.e., both the consecrated bread and wine) of the Eucharist in the Roman Catholic church. Denominations of Christianity that hold to a doctrine of Communion under both kinds may believe that a Eucharist which does not include both bread and wine as elements of the religious ceremony is not valid, while others may consider the presence of both bread and wine as preferable, but not necessary, for the ceremony.

Source: Wikipedia — Communion under both kinds (CC BY-SA 4.0)