X-rays, also known as radiographs, are a type of high-energy electromagnetic radiation that can penetrate through solid objects. Synonyms for X-rays include radiography, diagnostic imaging, Roentgen rays (named after their discoverer), and medical imaging. Other related terms include computed tomography (CT scans), magnetic resonance imaging (MRI), and ultrasound, which are also used in medical imaging to visualize internal structures in the body. X-rays are commonly used in clinical settings to detect bone fractures, dental problems, and other conditions. They are also used in industrial and security applications, such as checking for defects in metal components or screening for contraband at airports and border crossings.