Italian: ecco vs. c'è

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Italian speakers use "ecco" (here is, here are, there is, there are, comes, here come) to indicate the arrival or physical presence of one or more people, things, or places:

Ecco i miei genitori. Here are (come) my parents.

Ecco l'autobus. Here is (comes) the bus.

"C'è" and "ci sono" indicate the existence, although not necessarily the presence or arrival, of someone or something:

C'è il dottore oggi? Is the doctor in today?

Non c'è lezione domani. There is no class tomorrow.