Liquid biopsy is a non-invasive method for detecting and monitoring various diseases, including cancer, through the analysis of biomarkers in bodily fluids such as blood, urine, or saliva. This technique offers advantages over traditional tissue biopsies, as it is less invasive, quicker, and can provide real-time information about the disease status. Liquid biopsy has the potential to revolutionize personalized medicine by providing insights into a patient's disease progression, treatment response, and monitoring for recurrence.