Cookie Name	Cookie Description
FORM_KEY	Stores randomly generated key used to prevent forged requests.
PHPSESSID	Your session ID on the server.
GUEST-VIEW	Allows guests to view and edit their orders.
PERSISTENT_SHOPPING_CART	A link to information about your cart and viewing history, if you have asked for this.
STF	Information on products you have emailed to friends.
STORE	The store view or language you have selected.
USER_ALLOWED_SAVE_COOKIE	Indicates whether a customer allowed to use cookies.
MAGE-CACHE-SESSID	Facilitates caching of content on the browser to make pages load faster.
MAGE-CACHE-STORAGE	Facilitates caching of content on the browser to make pages load faster.
MAGE-CACHE-STORAGE-SECTION-INVALIDATION	Facilitates caching of content on the browser to make pages load faster.
MAGE-CACHE-TIMEOUT	Facilitates caching of content on the browser to make pages load faster.
SECTION-DATA-IDS	Facilitates caching of content on the browser to make pages load faster.
PRIVATE_CONTENT_VERSION	Facilitates caching of content on the browser to make pages load faster.
X-MAGENTO-VARY	Facilitates caching of content on the server to make pages load faster.
MAGE-TRANSLATION-FILE-VERSION	Facilitates translation of content to other languages.
MAGE-TRANSLATION-STORAGE	Facilitates translation of content to other languages.

Other interesting stuff