A kink is a sexual behavior or practice that falls outside of standard sexual practices.
A fetish refers to a specific object, sexual or non sexual body part, or behavior that must be present for one to achieve sexual arousal and enjoyment.
Some areas of kink and fetish may overlap.
Not all BDSM is fetish/kink, but all fetish/kink is BDSM... probably.
Some classifications are just my opinion
https://www.masterclass.com/articles/kink-vs-fetish
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Please let me know if any tags need updating or if I missed any. Have fun!