Cuddling and snuggling may seem like the same thing to many people, but in simple terms, they're different. Some people often use them differently already, as many sometimes suggest that cuddling is romantic and snuggling can be platonic. And in true definition, it reigns pretty true (via Difference Between).
Cuddling is usually suggesting more of "handling," and using your hands. This can include more movement and even fondling, which is why it's almost always used romantically between partners. It can lead to more sexually intimate moments, as well. Snuggling, on the other hand, can be seen as more platonic. Think of snuggling with your grandmother, or even with your own children and pets. Snuggling involves far less movement and often times includes "burrowing." This means that when we are laying with a loved one, burrowing our head into their chest or on their shoulder, that's snuggling.
As with any words though, the definition is really in the interpretation. So, it all depends on who you ask and who you talk to.
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