Oscilloscopes feature four high-speed analog channels

What is an oscilloscope?
Oscilloscopes are test instruments that display electronic signals (either waves or pulses) on a screen. It creates its own time base against which signals can be measured, and displayed frames can be frozen for visual inspection. It is sometimes abbreviated as CRO, for cathode-ray oscilloscope, or commonly called scope or O-scope.

What does GUI stand for?
Graphical user interface (GUI) is a kind of user interface that allows users to interact with a computer and computer-controlled devices, which employ graphical icons. Significant advantages of GUI compared to character-based interface include the ability to resize application windows and change style and size of fonts.

What does analog mean?
A continuously varying signal. For example, if an analog signal's range is from 0V to 5V, the signal can assume any voltage within that range such as 1.2, 2.4, or 4.7V. Microprocessors and microcontrollers usually cannot process analog signals directly and require conversion by an A/D converter before they can process the signal.