This is the 64th most frequent German word.
ich
"Ich" means "I" in English.
In this sentence, 'ich' serves as the subject pronoun and refers to the speaker introducing themselves.
Ich heiße Anna.
My name is Anna.
Here, 'ich' is again a subject pronoun referring to the person expressing their love for chocolate.
Ich liebe Schokolade.
I love chocolate.
'Ich' is used here as the subject for the inversion required in forming a question in German.