Exosomes are natural extracellular communicators.
They are tiny pods, the size of a virus, produced by almost all living cells including humans, animals, plants and bacteria.
Although exosomes have existed since the dawn of our existence, the first ones to be identified by scientists were from human blood cells in the 1960s, followed by bacterial exosomes in the 1970s.
They are different from liposomes, which are synthetically engineered in a laboratory composed of lipid bilayers surrounding an aqueous core.