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The plant-<i>Trichoderma</i>-pathogen triangle is a complicated web of numerous processes. <i>Trichoderma</i> spp. are avirulent opportunistic plant symbionts. In addition to being successful plant symbiotic organisms, <i>Trichoderma</i> spp. also behave as a low cost, effective and ecofriendly biocontrol agent. They can set themselves up in various patho-systems, have minimal impact on the soil equilibrium and do not impair useful organisms that contribute to the control of pathogens. This symbiotic association in plants leads to the acquisition of plant resistance to pathogens, improves developmental processes and yields and promotes absorption of nutrient and fertilizer use efficiency. Among other biocontrol mechanisms, antibiosis, competition and mycoparasitism are among the main features through which microorganisms, including <i>Thrichoderma</i>, react to the presence of other competitive pathogenic organisms, thereby preventing or obstructing their development. Stimulation of every process involves the biosynthesis of targeted metabolites like plant growth regulators, enzymes, siderophores, antibiotics, etc. This review summarizes the biological control activity exerted by <i>Trichoderma</i> spp. and sheds light on the recent progress in pinpointing the ecological significance of <i>Trichoderma</i> at the biochemical and molecular level in the rhizosphere as well as the benefits of symbiosis to the plant host in terms of physiological and biochemical mechanisms. From an applicative point of view, the evidence provided herein strongly supports the possibility to use <i>Trichoderma</i> as a safe, ecofriendly and effective biocontrol agent for different crop species.