Practical effects are done with hands on work. These effects are when you use puppets, costumes, props, molds, and anything that is real or can be seen on set without a screen. These are the traditional effects that people had to use back before computers could generate these new effects. They are also used today still in films.
CGI is always computer generated, done by animators and such. These are considered the fake effects due to them not being really there. They can not be seen without computers which can make it more of a problem for an actor to work with on set because there is nothing to look at or react to. Of course skilled actors may not run into this problem and CGI can look arguably better than practical effects, given that you have a good director and team. Many people don't realize that they are seeing actual puppets on screen and not computer created creatures. Which is good because that means the effects team is doing something right.
Practical effects aren't going anywhere. They are the classic way of doing effects and have a bigger feeling of effort put in than CGI. In my opinion however, I do think CGI looks better. Makeup and puppets can do what computers can't, sure, but it works the other way around as well. Explosions, fire, complex creature movements, they all look better with computers, and they are easy to pull off as well. Trying to set up explosives for a movie you are making is probably a bad idea that could get you in trouble, so stick with computers.
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