The CE mark certifies compliance with some standards. The device won’t give you a shock, catch on fire, radiate dangerous EMI, etc. Pretty much any consumer product has it. Look on the bottom of your laptop/tv/stereo/blender....etc
We have had customers who went through CE certification with our products. It’s apparently a big pain in the rear, and there are specialist companies that focus on this process. Most companies give up and go to these vendors.