What types of events can occur in signal communications?

In signal communications (for example, in signal processing systems or in programming using signals), the following types of events may occur:

• Interrupt signals — events that interrupt the current process to handle an important event.
• Error signals — notifications about errors or exceptional situations.
• Termination signals — events indicating the end of an operation or process.
• User-defined signals — specially designated events for interaction between processes or components.

In the context of Python, for example, signals can be system signals (SIGINT, SIGTERM, etc.), which can be handled using the signal module.