Rennet is one of those things that are going to depend on which vegetarian you’re talking to. It’s certainly not vegan. There’s also vegan alternatives to it that can be used. A lot of cheeses are made with rennet since it’s one of the most effective enzymes for curdling.
Authentic Parmigiano Reggiano is technically not vegetarian, it contains rennet (though usually people don’t care)
Rennet is one of those things that are going to depend on which vegetarian you’re talking to. It’s certainly not vegan. There’s also vegan alternatives to it that can be used. A lot of cheeses are made with rennet since it’s one of the most effective enzymes for curdling.
FWIW, I bought cheese made with vegan rennet the other day. I had to look it up, and apparently it’s made from mushrooms. It blew my mind.