"Voila" is an expression borrowed from French that is often used to draw attention to something or to indicate that something has been accomplished or completed. It translates roughly to "there it is" or "here you go" in English, and it is commonly used to present a result or reveal something after a process.
The word "voila" comes from the French phrase "voilà," which combines "voir" (to see) and "là" (there). It is used to express that something is now visible or available.