Meaning of “both” - Learner’s Dictionary

both

pronoun, determiner, quantifier us uk /bəʊθ/
The disease affects both humans and animals.We discussed both topics at length.I can carry both bags - they're quite light.They're both from Washington.He took us both out for lunch, which I thought was very kind of him.

A1 used to talk about two people or things:

The children both have red hair.
Both her parents are dead.
Both of my sisters are teachers.
Would you like cream, ice cream, or both?
both...and...

used to emphasize that you are talking about two people or things:

Both Jack and his wife are keen chess players.
→ See also have the best of both worlds

(Definition of “both” from the Cambridge Learner’s Dictionary © Cambridge University Press)