Answer: A buffer zone can be defined as the place covering the core zone, cultural and historical zone, and recreational zone.
Explanation: A typical national parks consists of the above states zones. The human interventions into the national parks is enforcing to have a national park with buffer zone.
Human beings are constructing homes and building, and running vehicles near the natural parks which is affecting the life of the species inside the national park.
So, there must be a zone surrounding all the zones to isolate the national park due to human interventions.