Special effects are the special ingredients that make movies magical. They create scenes that otherwise would be impossible to capture. Consider any of the 31 (and counting) Marvel Cinematic Universe movies.
The Avengers transform from civilians into superheroes. They leap from and into moving spaceships. They engage in epic battles against alien armies. Thanks to special effects, those fictional scenes look real.
Special effects can be practical or visual. Practical effects are actual objects or elements that filmmakers manipulate or that actors interact with in real time while filming. Many