Kerning is the process of increasing or decreasing the space between individual characters, adjusting the position of letters in relation to others. It’s commonly used on prominent pieces of text, such as headlines and logos. Note that tracking, on the other hand, is used to adjust the letter-spacing uniformly over a range of characters (read more about tracking).
Although the process of tweaking kerning may be very subtle, it can have significant effects on the legibility and overall presentation of text.
Designers kern letters to improve the overall symmetry of a word or phrase, which the default tracking settings provided in the font file may not be able to achieve alone.
As well as having an instant beautifying effect on text, kerning can also have an effect on the readability of the text. When done well, words just read better.
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