Do patents have national boundaries? National patents and international patents should be different. What is the difference?

Of course, national boundaries are different. For example, if you apply for a patent in the United States Patent Office, your patent will be protected in the United States, but your patent will not be protected in Africa. If you want to protect your patent in Africa, you need to apply for a patent in the patent offices of various African countries; But I have never heard of international patents. There is an international patent organization, and I often go to their website to search for patents, but it seems that there is no authorization. I'm not sure about the details. Ha ha.