A dark-sky preserve (DSP) is protected area without light pollution created by humans. These areas are used to help promote astronomy. Different countries have different programs for making areas dark-sky preserves. The International Dark-Sky Association (IDA) uses the word "reserve" instead of "park", or "preserve" with their dark-sky preserves. This is so that people don't confuse International Dark Sky Reserves (IDSR) and International Dark Sky Parks (IDSP).