If you say that someone or something has potential, you mean that they have the necessary abilities or qualities to become successful or useful in the future.

What does vast potential mean?

1 unusually large in size, extent, degree, or number; immense. 2 prenominal (intensifier)

What is mean by vast?

(Entry 1 of 2) : very great in size, amount, degree, intensity, or especially in extent or range vast knowledge a vast expanse.