This is the 197th most frequent Italian word.
io
"Io" means "I" in English.
The word 'io' is used as the subject pronoun meaning 'I', explicitly stating the subject of the sentence.
Io sono felice.
I am happy.
Here 'io' emphasizes the speaker by being set apart at the beginning of the sentence with a comma, adding a sense of clarification or self-reference.
Io, non ho capito.
I, I did not understand.
In this question, 'io' is used to refer to oneself in a casual and conversational manner, emphasizing the speaker's personal involvement or predicament.