It's hard to explain, THE THREAD, but I'll try...
Tickling is when a human touches another human in such a way as to make him/her laugh and/or squirm. The touches can be gentle or not-so-gentle. They can be strokes, pokes, rakes, massages, and what-have-you. Fingers, fingernails, feathers, brushes, and many other tools can be used to tickle. Body parts susceptible to tickling include the feet, toes, knees, thighs, ribs, stomach, sides, armpits, neck, breasts, nipples, ears, and even the genitals. Certain people can even orgasm from tickling, from what I've heard. Tickling can be torture, pleasure, or both, depending on the person's feelings. Well, thanks for listening, THE THREAD, and I hope I've helped you learn more about this phenomenon we humans call "tickling."