What is the function of 'putBeeper()' in a Karel program?

The function of 'putBeeper()' in a Karel program is to place a beeper on the current square where Karel is located. When this command is executed, Karel will drop one beeper at its current position on the grid. This is a crucial action within a Karel program, especially when creating tasks or challenges that require Karel to mark locations, indicate completion of tasks, or signify a path.

Other options relate to different functionalities that are not associated with placing beepers. Collecting beepers would require a different command, and checking for beepers or displaying counts would involve methods that assess or retrieve information about beepers rather than placing them on the grid. Understanding the role of 'putBeeper()' is fundamental in programming Karel to successfully complete various navigational or construction-related tasks.