yo
I (first-person singular subject pronoun)
Definitions
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1
Used as the subject of a verb to refer to oneself (I).
“Cada mañana yo desayuno con mi familia en casa.”
Every morning I have breakfast with my family at home.
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2
Used for emphasis or contrast to stress that it is the speaker performing the action (I, myself).
“Mis amigos no quieren ir, pero yo sí quiero ir.”
My friends don't want to go, but I do want to go.
In Spanish, subject pronouns like "yo" are optional because the verb ending already indicates the subject. "Yo" is used mainly for emphasis or contrast. Writing it with a capital letter ("Yo") is only correct at the start of a sentence — unlike English "I", which is always capitalized.