Unfortunately, they're not the tasty homebaked kind. this BBC webwise article is an impartial and factual summary of what cookies are and what they do (or don't)
BBC web wise cookie summary.
Description: This Google Analytics cookie is used to track traffic on our website and track each user’s visits and time for the first visit, previous visit and actual visit. This cookie will expire in 2038.
Description: This Goole Analytics cookie is used to track how long any given visitor is spending at our site; when the visit start and approximately ends. This cookie expires at the end of your session.
Description: This Goole Analytics cookie is used together with the __utmb cookie and has the same target. This cookie expires after 30 minutes.
Description: This cookie from Google Analytics is used to track traffic at our site and tracks where the user comes from (search engine, search words, link). This cookie expires after 6 months.
For a full technical breakdown of these cookies, read this (very technical) article from Google Developers.
Description: This cookie is a session cookie that keeps track of who the user is. This cookie is normally erased when the session is closed.
Description: This cookie is a session cookie that verifies if the user is authentic. This cookie normally expires at the end of the session.
Description: The assetView cookie controls the apperance of the asset browser when a logged in user is adding assets (images, documents etc) to an editable page. This Cookie expires when the browsing session ends.