What's the difference between investment immigrants, business immigrants and skilled immigrants?

Investment immigrants obtain green cards by injecting state-designated funds or company funds or directly purchasing state bonds.

Skilled immigrants:

The applicant's own technology or experience in a certain professional field directly or indirectly creates benefits for the country, and the country invites him to obtain a green card.

Business migration:

Mostly entrepreneurial immigrants. That is to say, start an enterprise or company with a scale not lower than the national standard and legally pay state taxes. Some countries need enterprises founded by applicants to solve the employment problem of local people. You can get a green card if you meet the requirements. This category is collectively referred to as commercial immigrants.