A close relationship between two organisms in which at least

one of the organisms benefits.

Symbiosis is a close relationship between two species in which at least one species benefits.

The interaction among organisms within or between overlapping niches can be characterized into five types of relationships: competition, predation, commensalism, mutualism and parasitism ... Symbiosis refers to a close relationship in which one or both organisms obtain a benefit.

Explanation:

In agriculture and gardening, a beneficial organism is any organism that benefits the growing process, including insects, arachnids, other animals, plants, bacteria, fungi, viruses, and nematodes. Benefits include pest control, pollination, and maintenance of soil health.