the computer made special effects are called CGI (computer generated imaginery) and the traditional optical or mechanical special effects are called special effects
Special effects come in a huge variety of forms. The term covers almost everything that is created to enhance a shot. Many of them are created on a set - fake explosions using compressed air for...
well, in this movie there was only a few special effects. I can think of is when they needed to make Robert Pttinson (edward) shiny/ sparkly ,when they make him run fast and when he glides from tree...