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"Tickle" refers to the peculiar sensation caused by light touching or stroking of the skin, often resulting in involuntary laughter or squirming. It can be divided into two types: *knismesis* (a mild, itchy feeling) and *gargalesis* (a more intense, laughter-inducing reaction). The exact evolutionary purpose of tickling remains debated, though theories suggest it may promote bonding, teach self-defense, or enhance social interactions. Tickling activates nerve endings linked to touch and pain, triggering reflexive responses. While often playful, excessive tickling can become uncomfortable. The phenomenon is universal across cultures and has been studied in psychology and neuroscience for its unique blend of pleasure and discomfort.