In Western use, mostly for blowing one’s nose or wiping sweat off one’s brow. Sometimes in a cinematic manner which evokes refinement in the course of labor. Might also be used to blot tears, either one’s own or to give to someone who has tears but no hanky.
In East Asian use, as a hand towel, since many public bathrooms do not provision paper towels. Very useful in the USA as well, since many restrooms are moving towards air dryers of varying quality. But a handkerchief is always on-hand and can also reduce time spent in the restroom.
I personally keep two handkerchiefs on me, for both the Western and East Asian use-cases.
In Western use, mostly for blowing one’s nose or wiping sweat off one’s brow. Sometimes in a cinematic manner which evokes refinement in the course of labor. Might also be used to blot tears, either one’s own or to give to someone who has tears but no hanky.
In East Asian use, as a hand towel, since many public bathrooms do not provision paper towels. Very useful in the USA as well, since many restrooms are moving towards air dryers of varying quality. But a handkerchief is always on-hand and can also reduce time spent in the restroom.
I personally keep two handkerchiefs on me, for both the Western and East Asian use-cases.
Yoy can also wear them on your head.