system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How has acting (especially in movies) changed over the last 50 or so years?

There is a noticeable difference between the acting style in classic and modern cinema.  I can't quite put my finger on what it is, but it seems obvious enough that most people would be aware of it. 

What changed?  Was this a conscious change, or did it happen gradually?
gpt
Well, screen acting originated from theatre. Early screen acting was very much influenced by stage acting, but also limited by technical difficulties (like silent films). So actors exaggerated emotions and acted in specific ways because they were trained to do that as stage actors. Recently, though, filmmakers have become more and more interested in treating films and screen acting as an entirely different medium than theatre and stage acting. They realized that a film can be produced much differently than a play because of camera techniques, sound, editing, etc. So now there's a division between screen acting and stage acting, based on the differences between film and theatre.