The National Institute of Health provides a definition of biomarkers as a "characteristic used to measure and evaluate objectively normal biological processes, pathogenic processes, or pharmacological responses to a therapeutic intervention." This definition highlights the potential of biomarkers to personalize medicine. They offer a variety of benefits, including the early detection of diseases like cancer, and providing diagnostic, prognostic, and predictive information. Biomarkers also support the assessment of risk and disease monitoring in high-risk populations, and can be applied to guide targeted therapy and differential diagnosis. Additionally, biomarkers can be used to monitor the response to therapy, providing valuable information for adjusting treatment plans and improving patient outcomes. The use of biomarkers is an exciting area of research that offers a wealth of opportunities for improving the practice of medicine.