probe

# Probe A **probe** is an instrument, device, or investigative tool used to explore, examine, or gather information about something that is difficult to access directly. The term applies across many fields including science, medicine, computing, and law. **In space exploration**, a space probe is an uncrewed spacecraft sent beyond Earth orbit to study planets, moons, asteroids, comets, or interstellar space. Famous examples include Voyager 1 and 2, the Mars rovers, and the New Horizons mission to Pluto. Probes transmit data back to Earth using radio signals. **In medicine**, a probe is a slender instrument used to explore wounds, body cavities, or tissue. Ultrasound probes (transducers) emit sound waves to produce internal images. Genetic probes are short DNA or RNA sequences used to detect complementary sequences in a sample, important in diagnostics and research. **In computing and networking**, a probe is a request or packet sent to test connectivity, measure response time, or gather information about a system. Network probes are used in diagnostics, security scanning, and monitoring infrastructure health. **In law and journalism**, "probe" is commonly used as a synonym for a formal investigation or inquiry — such as a government probe into corruption or a journalistic probe into misconduct. The word comes from the Latin *proba*, meaning "proof" or "test."