What's the difference between a foreign language school and a Sanjian campus?

Jinan Foreign Language School is a public school, but Sanjian Branch is a private school jointly run by schools and enterprises.

Look at their recruitment brochures this year: salaries are paid according to the standards of public institutions (including wages and various subsidies); Pay five insurances and one gold for employees on time; Standardize the implementation of the annual assessment and professional title evaluation policy.

It seems that there will be no establishment.