This document discusses various types of interactions between organisms in a community, including tolerance, which determines an organism's habitat; niche, which is an organism's role and interactions in its environment; competition between members of the same or different species for resources like food and space; predation where one organism feeds on another; herbivory which is when herbivores feed on plants; keystone species that greatly impact the community if their population changes; and symbiotic relationships like mutualism where both species benefit, parasitism where one harms the host, and commensalism where one benefits and the other is not affected.