What does it mean for public institutions to openly recruit labor contract employees? Are you a temporary worker?

Just like entering a company, you will sign a labor security contract with the company, that is, others can compensate you for some money when they don't need you, unlike career establishment, as long as you don't make mistakes, you will always be guaranteed. To put it bluntly, this organization is short of staff, but the establishment is full, so it is necessary to recruit some personnel in the form of contract workers. The salary system will be given to you according to the standards of the staff, but without the guarantee of preparation, others can always find a reason to fire you.