I’ve been learning English for 5 years, but I don’t understand when or how to use underline character (_) in English.
Please can you help me explain it to me?
Example about hyphen, I read here and then I understood it. But underline I can’t.
To quote from one of the links: To underscore something in a piece of writing that is particularly important: “books are not to be placed on the floor.” The underline gives the word a bit more gravity. When spoken, the words “are not” would be stressed or emphasized over the other words in the sentence.
I can’t figure out how to underline here, but “are not” should be underlined, though italics lends a similar emphasis.
You would use it similarly to when you might stress a word in a sentence because it is more important.
For the underscore however, it iss primarily used in programming in places which a space is not allowed (or inconvenient, like a file name). It’s origin is the typewriter, where it was used to underline words, see here