Transcription: This is an Explain button. Click on the speaker for a full explanation of the C++ code beside the button. When the button starts and stops, the speaker symbol changes shape. You can also click on a specific line in the code for an explanation of that part or that line. A pointer like the one now pointing to the Explain button appears beside each segment of code as it is being described. There is an Explain button that you can try on the next page of this tutorial.