What does presto mean in music?

According to Burston, they used to go for food at a place on Old Compton Street.

First in Nigeria, then across Africa and into Asia, followed by an established migration pattern.

These people are on wires, laying their ears down, skimming away, and presto!

A clerk on a stool plunged into the war a month after, carrying a gun and marching.

Mrs. Spider spun a glossy silk web over the places where the seams were, and presto-chango!

Victor had a hard time reading the notes because he didn't understand the terms adagio, presto, and sforzando.