Ultrasound (or sonography) is a medical imaging technique using high-frequency sound waves to create images of internal body structures. A transducer emits sound waves that bounce off tissues, with returning echoes converted to real-time images. Ultrasound is particularly valued for being non-invasive, not using radiation, and safe during pregnancy—prenatal ultrasounds monitor fetal development. Beyond obstetrics, ultrasound examines abdominal organs, heart (echocardiography), blood vessels, and musculoskeletal structures. Ultrasound is typically performed by sonographers or physicians in hospitals, clinics, or imaging centres. Provincial health insurance covers medically necessary ultrasounds. Wait times for non-urgent ultrasounds can be significant in some regions. Portable ultrasound devices have expanded use in emergency and point-of-care settings.