PCT refers to the international patent application submitted according to the international patent cooperation treaty, which enters the national phase in a country and enters the national phase in a designated country. Not all countries form applications by default. Most importantly, you must specify which countries you want to enter. PCT patent applications can be inventions or utility models. PCT patent application is much more convenient than single-country application submitted in accordance with the Paris Treaty and bilateral agreements.
The so-called invention and utility model are just two kinds of patents, which are not a classification method with PCT.