30.5 Filling Text
Filling text means breaking it up into lines that fit a
specified width. Emacs does filling in two ways. In Auto Fill mode,
inserting text with self-inserting characters also automatically fills
it. There are also explicit fill commands that you can use when editing
text leaves it unfilled. When you edit formatted text, you can specify
a style of filling for each portion of the text (see Formatted Text).