PS. There is also the case where you listen to the ad, then you listen to the video you wanted in the first place, then another add plays automatically and the next video plays that you didn’t ask for, the you finally stop the video to read the comments below and another video starts to play while you are banging on stop. They just play without any clicking and won’t stop until you just kill the whole window. I’ve even gone to the bathroom with the video stopped and 2-3 minutes later, I hear another ad and another video starting back up. It’s just no fun anymore fighting the bloodsucking leeches.
If you are referring to YouTube vids, in the upper right section of the site there is an “Autoplay” icon that you have to click over to “Off” to disable the next vid from playing. Just once, though, as once you click it the next vids you view will also know not to autoplay.