What does voila mean?

It's a French phrase that translates to "there it is" or "there you have it" in English. In English, it's usually used as a slang term to say something along the lines of "ta da." Also, it is sometimes pronounced incorrectly: said "wala" when the actual way to say it is "vwah-lah."

"Voila" is used to call attention to or express satisfaction over something. EX: "Then you add onions and tomatoes to it and voila, you have a delicious pizza."
"Voila" in french means "here" or "there we go!" (not meaning a place).