A digital oscilloscope is an electronic instrument used to visualize and analyze electrical signals. It captures waveforms and displays them on a screen, allowing users to observe changes in voltage over time. This tool is essential in various fields, including electronics, engineering, and telecommunications, for troubleshooting and designing circuits. Unlike analog oscilloscopes, digital oscilloscopes convert signals into digital data, enabling advanced features like storage, measurement, and analysis. They often include built-in functions for triggering, math operations, and data export. Popular brands include Tektronix and Keysight, which offer a range of models for different applications.