Interactions are the effects organisms in a compuunity have on each other. A community is an ineracting group in a common location. Interactions can be positive, negative or neutral. Members of a species can be competing for the same resources. Or it can be inter speciies interaction which could be competing for the same food, light, or space.
Interspecific interations refers to interactions between different species. Intraspecific, means internal or interactoins between members of the same species.