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Soft wrapping allows line lengths to adjust automatically with adjustments to the width of the user's window or margin settings, and is a standard feature of all modern text editors, word processors, and email clients.
Manual soft breaks are unnecessary when word wrap is done automatically, so hitting the "Enter" key usually produces a hard return.
For example, it is common to print postal addresses in a multiple-line format, but the several lines are understood to be a single paragraph.
Formatting settings, such as first-line indentation or spacing between paragraphs, take effect where the carriage return marks the break.
For example, in HTML there is a
tag that has the same purpose as the soft return in word processors described above.
A primitive line-breaking feature was used in 1955 in a "page printer control unit" developed by Western Union.
This system used relays rather than programmable digital computers, and therefore needed a simple algorithm that could be implemented without data buffers.
[3] The greedy algorithm for line-breaking predates the dynamic programming method outlined by Donald Knuth in an unpublished 1977 memo describing his TeX typesetting system[4] and later published in more detail by Knuth & Plass (1981).