Text appears letter by letter

Does anyone have code or a link to a tutorial or site illustrating how to do this?

Sorry for such a non-specific question. I did a search that turned up nothing. Mostly I’m seeing stuff about horizontal scrolling text.


EDIT: This is the second posting of this, sorry. Oddly, the first I saw the original was RIGHT AFTER I POSTED THE SECOND ONE. Anyone have any idea what causes that? Or am I going crazy? Probably the latter.