Exosomes are small vesicles that are released by cells and carry various biomolecules such as proteins, RNA, and lipids. They play a critical role in cell-to-cell communication and have been shown to be involved in processes such as immune response, tumor progression, and tissue regeneration. Exosomes are increasingly being studied for their potential use as biomarkers for various diseases, as well as for their therapeutic applications in drug delivery and regenerative medicine.