Post by charlesbut adjusting the spacing by very small amounts over the line so as to be
not obvious.
The microtype package offers a LaTeX interface to the
microtypographic extensions that pdfTeX introduced, which
have since spread to XeTeX and LuaTeX as well. It
- tweaks the position of characters at line edges slightly
to achieve a more balanced look,
- subtly stretches or shrinks characters to improve line
breaks and spacing,
- refines the space between words and around punctuation,
- fine-tunes the spacing between certain letter pairs,
- allows enabling or disabling ligatures like "fi" or "fl", and
- adjusts the spacing between letters in words, which is
particularly useful for headings.
It's like the secret sauce that takes your document from okay to
looking like it was professionally typeset, without anyone being
able to put their finger on why it looks so good. Kind of like how
a splash of sriracha can elevate a dish without overpowering it.