Postdoctoral researchers, commonly referred to as post-docs, are typically considered employees of the institution where they are conducting their research. They often receive a salary and benefits similar to other employees, although their status can vary based on the funding source, institution's policies, and the specific terms of their appointment.
In many cases, post-docs are hired on temporary contracts with specific research goals and responsibilities, which distinguishes them from permanent faculty positions. The classification as employees also means they may be entitled to certain rights and protections under labor laws, depending on the jurisdiction.