Youtube Ads without adsense account?

I created a new google account, then I created I new youtube account, then link youtube to google. But I haven`t created google adsense account yet coz I have no website but theres ads showing on my youtube video.. Why is that?

Firstly Google reserve the right to show ads on any video  they wish, its how YouTube makes its money. Sometimes, if your video has content covered by copyright, music, images or suchh like, they do it at the copyright holders request.

To get you own AdSense Ads on your videos you must first apply for a YouTube Partnership, you will find the link at the bottom of the YouTube page once you have signed in. If you are accepted then they will send you an email with a special link in which allows you to apply for an AdSense account without a website. Do not apply direct to AdSense, that just messes your application up.