Let's imagine the following situation: we invite people for dinner and when we open the door we will tell them "welcome to our house!" (Benvenuti nella nostra casa). In Italian we use "benvenuto", a word that can have a different ending based on gender and number.
Benvenuti - plural, masculine and mixed
Benvenute - plural, feminine
Benvenuto - masculine, singular
Benvenuta - feminine, singular
Another way is: "Prego"->You're welcome