Yes, you can immigrate to Australia without a job offer. However, a job offer from an Australian employer who is approved by the government can simplify your immigration process. The existence of an approved job offer enables you to obtain an Employer Nomination Scheme (Subclass 186) or increase your Subclass 190/491 points when the position belongs to a state's job demand list. A valid job offer enhances your visa invitation prospects when you apply for IT, engineering, healthcare, and trades occupations that are in high demand. Through employer sponsorship, you can eliminate specific criteria including high point thresholds and regional residence requirements.