What input method do foreigners use?

That depends on which country you come from. If you only use English, such as English-speaking countries such as Britain and the United States, you don't need any input method, because the operating system of the computer is originally an English keyboard, so you can just input English directly. Other non-English speaking countries need input methods to install their own characters. Computers with multilingual input methods can only input and print multiple characters by switching.

Only the multi-input method (multi-Chinese character and graphic symbol input method) is the only one in the world that can directly input more than 50 languages such as China, Japan and Korea, involving 136 legal characters in non-English-speaking countries. There is no need to switch input methods in other languages.