Originally posted by panonski and what exactly that means
WEATHER RESISTANCE.
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As we can see from several users,
that weather must be almost shine and sunny
No, that's simply inaccurate.
Weather
resistance means just that, and nothing more. There are many gaskets between the body's clam-shell parts, top and bottom, mount, controls, ports and internal flash. They put them there for a reason - to reduce the chances of moisture and dust getting inside. They provide weather
resistance - not weather proofing.
Any DSLR, mirrorless or compact camera, even without these gaskets, is - to a minor extent - weather resistant due to the electronics and mechanical components being enclosed in a body... But on WR cameras, the interlocking design of the body parts and the many gaskets are intended to improve that resistance considerably. That doesn't equate to weather or water proofing, though.
Of course there have been some failures, and I don't doubt that some of those have been in relatively minor weather conditions. Manufacturing tolerances will mean that some camera bodies are more tightly interlocked than others, and some gaskets will have slight imperfections. Still, they provide greater resistance than a camera without interlocked body parts and gaskets.
I wonder if you've ever driven a Land Rover? Not the latest models, but the traditional type used by farmers and military forces the world over? Like most cars, they have rubber gaskets around the doors and tailgate to prevent water ingress. I say "prevent", but I should say, "reduce the chances". Anyone who's driven one in the rain, or left it sitting outside in wet weather for some time, will be aware that they can leak like sieves. That's due to manufacturing tolerances. Still, they keep out water far better than they would if those gaskets weren't fitted.
If you want a waterproof camera, look for something with the relevant IP ("Ingress Protection") rating. So far as I'm aware, though, you won't find a single interchangeable lens camera with such a rating.
We can see from several users, there are plenty of weather resistance success stories. I provided an account of one of mine in a thread
full of them, some months back...