Permaculture is a holistic approach to landscaping. It incorporates ecology, agriculture, and appropriate technology to create a self-sustaining ecosystem that supplies food, shelter, and other necessities to the humans who live there.
A pond can be a vital part of an ecosystem, supplying pest management, mulch and fertilizer, and relaxation. The video goes into more detail.
Pond photo via Shutterstock
Related: Touring a Frog Pond