Extracellular Vesicles (EVs), particularly exosomes, are nano-sized membrane-bound particles secreted by cells. They contain: mRNA microRNA Proteins Lipids EVs reflect the physiological or pathological state of their parent cells, making them promising candidates for non-invasive diagnostics via liquid biopsy. Technical Considerations in Isolation Standard isolation protocols involve: Differential centrifugation Ultracentrifugation Density gradient centrifugation (sucrose or iodixanol gradients) Critical parameters include: Accurate control of g-force Minimization of protein contamination Preservation of vesicle membrane integrity Disease Applications In Breast cancer, EV-derived microRNAs are linked to tumor progression and metastasis. In Prostate cancer, exosome-associated PSA demonstrates enhanced diagnostic specificity. Emerging evidence also highlights EV involvement in Type 2 diabetes through pathways related to insulin resistance. Research Challenges Lack of global standardization Variability in isolation protocols Need for validated quantification methods Future Directions Microfluidic-based isolation systems Nanoparticle Tracking Analysis (NTA) AI-assisted biomarker pattern recognition This field represents a transformative shift toward precision and personalized medicine.