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One long unbroken line of text is hard to work with in places that don't wrap automatically - a fixed-width terminal, a form field, a spreadsheet cell. This splits text into multiple lines after a set number of characters (breaking at a word boundary whenever one is available within the limit), after a delimiter you specify, or after every sentence.
When you'd use this
Wrapping a long line to a fixed width for a monospace display or fixed-width field, splitting a delimiter-joined string back into separate lines, or breaking a paragraph into one line per sentence for easier editing.
Common errors
Character-based wrapping breaks at the nearest space at or before the limit when one exists, so line lengths will vary slightly rather than being exactly N characters every time. A single word longer than the limit itself (a URL, a long identifier) has no space to break at, so it gets cut at the exact limit instead - that's the one case where a line is cut mid-word.
Frequently asked questions
Why aren't all my wrapped lines exactly the character limit I set?
Because wrapping prefers to break at a word boundary - a line will end slightly before the limit if that's where the last full word fits, rather than cutting a word in half. The exception is a single word longer than the limit itself (no space to break at within range), which does get cut at the exact limit rather than being allowed to overflow.
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