All animals, plants and microbes in a biological community interact with each other.

– It is obvious that in nature, plants, animals and microbes do not and cannot live in isolation but interacts in various ways to form a biological community.

$\rightarrow \quad$ Interspecific interactions arise from the interaction of populations of two different species.

$\Rightarrow$ These interactions may be beneficial, detrimental or neutral to one of species or both.

It various results are given below in table 

Species $A $	Species $B$	Name of Interaction
$+$	$+$	Mutualism
$-$	$-$	Competition
$+$	$-$	Predation
$+$	$-$	Parasitism
$+$	$0$	Commensalism
$-$	$0$	Amensalism

$+$ sign for beneficial interaction, $-$ sign for detrimental interaction, $0$ sign for neutral interaction.

$\Rightarrow$ Both the species benefit in mutualism and both lose in competition in their interactions with each other.

In both parasitism and predation only one species benefits (parasite and predator, respectively) and the interaction is detrimental to the other species (host and prey, respectively).

The interaction where one species is benefitted and the other is neither benefitted nor harmed is called commensalism. In amensalism on the other hand one species is harmed whereas the other is unaffected.