Non-invasive techniques refer to methods used in various fields, particularly in medicine, that do not require any surgical procedures or penetration of the body. These techniques are essential for diagnosing and monitoring health conditions while minimizing discomfort and risk to patients. Examples include MRI, CT scans, and ultrasound, which allow healthcare professionals to visualize internal structures without invasive measures. These methods are not only safer but also often more cost-effective and quicker than traditional invasive procedures. By utilizing technologies like magnetic resonance imaging and ultrasonography, practitioners can gather critical information about a patient's health, leading to timely and accurate treatment decisions.