When do you need to use a loop in Karel’s programming?

Using a loop in Karel’s programming is essential when Karel needs to repeat a specific action multiple times. This is particularly useful for tasks that involve performing the same operation repeatedly, such as moving a certain number of steps, picking up or putting down multiple beepers, or filling a row with beepers. By utilizing a loop, you can simplify your code and make it more efficient, as it reduces the need to write the same instruction numerous times. Loops enable Karel to efficiently execute repetitive tasks until a certain condition is met, streamlining the programming process and enhancing Karel's functionality in navigating its environment.

While there are scenarios where Karel might need to run until a stop command is given, using a loop is primarily about repetition rather than duration of execution. Additionally, Karel's programming does encounter obstacles, but this doesn’t inherently require the use of a loop. Lastly, while it is technically possible to program without loops, they are an integral part of making Karel’s programming more effective in dealing with repetitive actions.