Why is there noise in the laptop?

Question

Sound cards

I use headphones with 3.5 mm. And now periodically, when I look at something, a non-stop noise begins to appear. That is, not a squeak, not jerks, but an endless line, as if an additional sound track was thrown. The sound of the content itself does not disappear, but becomes quieter than the noise itself.
If I pull out the plug from the socket, then the noise already continues by the speakers of the laptop.

The problem is solved (of course temporarily) only by reloading the page itself with the content that I watched. It doesn’t matter if I pulled the plug out of the socket and the noise is already in the speakers or I didn’t pull it out, the reboot fixes everything temporarily.

I want to understand what the problem is and how to solve it.