What does Chrome's “Incognito Mode” do exactly?

Question

I was under the impression that Chrome in Incognito Mode wouldn\'t accept or send cookies, since they could be used to identify you. When starting up Incognito Mode, I do ha

Answer 1

Just an important privacy note on @Jared Dykstra answer and @Mark comment.

but everything starts "fresh" when the incognito window is launched. This applies all storage, including Cookies

Not 100% true

Today I opened a new fresh chrome incognito window and requested youtube.com . but I surprisingly found that youtube is recommending some videos to me!!! How? based on what ? I'm supposed to be a very new client with fresh browser - I noticed the recommended videos was based on the videos I usually watch while signed in to my google account from chrome or firefox -

After investing the cookies I was shocked that chrome is sending these cookies to youtube.com along with the very first request send to youtube.com from a new freshly opened incognito window.

GPS
PREF
VISITOR_INFO1_LIVE
YSC

I guess youtube.com servers used these cookies to know who I'm and recommend videos for me based on them.

I checked Firefox and it does not do that, it starts the private windows with 100% empty cookies header!