What are these pixels

[Bevelco]

When im converting to vray mat i get these pixels while rendering.What are they?the resolution is 2k
Can someone explain?

[Galen Helfter]

Those little speckles are called fireflies, they're a rendering artifact that can be common in path tracers. You can fix this in a few ways. First, increase the samples for the render and second, try applying a denoiser of some kind afterwards.

https://docs.chaosgroup.com/display/VRAY3MAX/V-Ray+Denoiser+%7C+VRayDenoiser

Here's the docs on the VRay denoiser, you can see they have similar rendering artifacts in the before/after image.

[Bevelco]

Ok. Thanks. Increased samples and overall quality. also noticed when i switch the resolution output at the substance node,takes time until its applied and no any status bar to show .
Solved anyway.