The Forest Stewardship Council certifies forests based on the way they are managed and maintained, to make sure there’s a plan for continued maintenance of the forest over a period of years, including wildlife and local culture protections. According to the FSC:

FSC accredited, independent, “third-party” certification bodies or “certifiers” certify forests. They assess forest management using the FSC principles, criteria, and standards, each certifier uses their own evaluative process. This allows FSC to remain outside of the assessment process, and supports the integrity of the standard, and of the FSC system. Certifiers evaluate both forest management activities (forest certification) and tracking of forest products (chain-of-custody certification). There are 12 FSC-accredited certifiers around the globe.

You can read more about the certification speicfics here.