pronoun/la/
accusative of ella, ello (when the antecedent's implied gender is feminine), and usted (when referring to a woman); her, it, you (formal); impersonal neuter pronoun (accusative) in certain colloquial phrases: it, this
“La sabe toda.” — He/she knows everything (it all)
From Old Spanish ela, from Latin illa(m), feminine singular of ille.