The most important thing is to distinguish between laminate and vinyl flooring. The two terms are often used interchangeably even though they are very different flooring types and should never be called by the same term.
Laminate has a wood fiber core (HDF or MDF), and this has historically been very susceptible to water damage. Newer versions have either wax on the tongue and groove parts or plastic added to the wood fiber. This certainly improves their water resistance but it can still vary depending on the exact composition. Some might actually be close to waterproof and others still vulnerable to swelling from water.
Vinyl plank, whether glued down or luxury vinyl plank click-together are made of plastic through and through. This makes the material itself impossible to damage from water. In terms of whether it's waterproof to water that gets into the seams, that depends on how well it was installed and how robust the locking mechanism is.
The thicker versions with tight locking mechanisms are usually the most waterproof. However, if you see planks sliding or pulling apart, then it's no longer waterproof.
Another type of waterproof flooring is a hybrid. This is wood on top and has an SPC (stone polymer composite) core just like luxury vinyl plank. Because the top is real wood it will not be possible just from viewing it (when installed) to identify if the core is plywood, HDF, or SPC, so we can't tell if it's waterproof.
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