there (it) is, there (it) comes; here (it) is, here (it) comes; that is (introduces something one has said, whereas voici something one is about to); expresses something completed; used with pronouns, can serve as a loose copula; expresses the unexpected or abrupt nature of an event
“Voilà l’homme tout entier, s’en prenant à sa chaussure alors que c’est son pied le coupable.” — There is man in his entirety, blaming his shoe when his foot is guilty.
Literally, “look there”. From vois (“see!, look!”), second-person singular imperative of voir (“to see, to look”) and là (“there”).