What is the significance of Australian employer nomination scheme immigration? Is it difficult for international students to have security after graduation?

Employer nomination is to obtain the employment of qualified employers in Australia (with the approval of the Australian Immigration Bureau, foreign workers can be sponsored), sign a formal contract with the employer, and then apply for immigration to Australia. It can be said that it is difficult for foreign students who have just graduated to be funded. It is better to say that after working in Australia for one or two years.