[ETL]

the evidence for dark matter is strong, though not conclusive. Dark matter is matter that does not interact with electromagnetic fields (light) but has mass.

There are two basic forms of dark matter, baryonic and non-baryonic. Baryonic is ordinary matter which we, for one reason or another, simply cannot see, because, either, it isn't emitting light or it isn't reflecting light. The other form that you refer to is the non-baryonic form. My guess is that our theories of gravity are not quite right (on the large scale) and so we are wrongly inferring that the non-baryonic stuff exists.

[ETL]

[non-baryonic] Dark matter is matter that does not interact with electromagnetic fields (light)...

IF it actually exists, it wouldn't interact with ANY form of electromagnetic radiation, not just the visible light portion of it. This would include: x-rays, gamma rays, ultra-violet, microwaves, etc, etc.