 exosomes are small membrane-bound particles secreted by cells into the extracellular environment. They play an important role in cell-to-cell communication and recent studies suggest that they may be used as vehicles for delivering therapeutics. Exosomes derived from various cells and modified exosomes have been studied extensively and this paper reviews the current understanding of these particles' potential applications. This article was authored by Edwin J. Bungalowa, Wei Wang, Tai Ying Yin, and others.