Exosomes are membrane-bound vesicles secreted by most cells, playing a key role in cell-cell communication and disease progression. They contain proteins, lipids, and nucleic acids, making them valuable biomarkers for disease diagnosis, prognosis, and therapy. Isolating exosomes from complex biological matrices is crucial for their application in clinical settings. Various techniques have been developed for exosome isolation, including differential ultracentrifugation, size-based methods, immunoaffinity capture, exosome precipitation, and microfluidics-based approaches. Each technique has its advantages and challenges, such as contamination, low yield, and limited scalability. Differential ultracentrifugation is currently the gold standard, but it is labor-intensive and may result in contamination. Size-based methods like ultrafiltration and size exclusion chromatography (SEC) are faster and more scalable but may not achieve high purity. Immunoaffinity capture offers high specificity and purity but requires specific biomarkers. Exosome precipitation is simple but may co-precipitate non-exosome contaminants. Microfluidics-based techniques offer high efficiency and scalability but are still in early development. The challenges in exosome isolation include the complexity of biological samples, the similarity of exosomes to other extracellular vesicles, and the heterogeneity of exosomes. Despite these challenges, advances in exosome isolation techniques are essential for their application in clinical diagnostics and therapeutics. The development of more efficient and cost-effective methods is critical for the widespread use of exosomes in medicine.Exosomes are membrane-bound vesicles secreted by most cells, playing a key role in cell-cell communication and disease progression. They contain proteins, lipids, and nucleic acids, making them valuable biomarkers for disease diagnosis, prognosis, and therapy. Isolating exosomes from complex biological matrices is crucial for their application in clinical settings. Various techniques have been developed for exosome isolation, including differential ultracentrifugation, size-based methods, immunoaffinity capture, exosome precipitation, and microfluidics-based approaches. Each technique has its advantages and challenges, such as contamination, low yield, and limited scalability. Differential ultracentrifugation is currently the gold standard, but it is labor-intensive and may result in contamination. Size-based methods like ultrafiltration and size exclusion chromatography (SEC) are faster and more scalable but may not achieve high purity. Immunoaffinity capture offers high specificity and purity but requires specific biomarkers. Exosome precipitation is simple but may co-precipitate non-exosome contaminants. Microfluidics-based techniques offer high efficiency and scalability but are still in early development. The challenges in exosome isolation include the complexity of biological samples, the similarity of exosomes to other extracellular vesicles, and the heterogeneity of exosomes. Despite these challenges, advances in exosome isolation techniques are essential for their application in clinical diagnostics and therapeutics. The development of more efficient and cost-effective methods is critical for the widespread use of exosomes in medicine.