This is the 87th most frequent Italian word.
stesso
"Stesso" means "same" or "self" in English.
Here, 'stesso' emphasizes the subject (I), showing self-reference.
Io stesso andrò alla festa.
I myself will go to the party.
In this case, 'stesso' indicates that the choice is identical, referring to sameness.
Hanno scelto lo stesso ristorante per la cena.
They chose the same restaurant for dinner.
'Stesso' describes similarity or identity of the situation across locations.