All these three terms, viz., in vivo, in vitro, and in silico are used in the field of biological sciences. The term in vivo is composed of in (in) + vivo (life, living, living body), thus in vivo means “in a living organism”. The term, in vivo is applied to those biological processes or experiments that occur or are conducted inside a living organism. In vitro is applied to those biological techniques or processes that occur outside the body of a living organism, for example, in the laboratory. In silico is applied for those biological experiments or studies that are carried out on the computers. To know more about in vitro, see what is in vitro? To know more about in silico, see what is in silico?