What do people always call "provincial nomination" among Canadian immigrants? What do you mean by "going to the Federation"?

Canada's immigration policy is divided into provincial nomination and federal plan. After studying in Canada for more than two years, you can apply for immigration if you are given a three-year work visa and work for 12 months. This is Canada's federal immigration plan. No matter which province you are in, you can immigrate according to this condition. However, Canadian provinces can formulate their own immigration policies according to their own economic and employment characteristics, which is provincial nomination. For example, the provincial nomination of the three central grassland provinces means that you can immigrate after working for six months. For example, you can immigrate directly after graduating from Ontario with a master's degree. These are the so-called provincial nomination plans.