In what cases is it appropriate to apply multithreading in software applications?

Multithreading is advisable in cases where it is necessary to perform multiple tasks simultaneously to improve the application's performance or responsiveness. For example:

• Input/output (I/O) processing — reading files, network requests, where the main thread should not be blocked.
• Parallel computations that can be divided into independent parts.
• Improving user interface responsiveness so that heavy operations do not block the UI.

In Python, due to the GIL, multithreading is effective mainly for I/O-bound tasks, while for CPU-bound tasks, it is better to use multiprocessing.