In other words, the Ein Sof is God before He decided to become God as we now know Him.
The Sefirot are divine emanations that come from the Ein Sof in a manner often described as a flame. As the first Sefira is closest to Ein Sof, it is the least comprehensible to the human mind, while in turn the last is the best understood because it is closest to the material world that humanity dwells on.
The sefirot are described as channels of Divine creative life force or consciousness through which the unknowable Divine essence is revealed to mankind.
The seven subsequent sefirot (Chesed, Gevurah, Tiferet, Netzach, Hod, Yesod and Malkuth) describe the primary and secondary conscious Divine Emotions.
Two sefirot (Binah and Malkuth) are feminine, as the female principle in Kabbalah describes a vessel that receives the outward male light, then inwardly nurtures and gives birth to lower sefirot.
The first sefirah, Keter, describes the Divine superconscious Will that is beyond conscious intellect.
The next three sefirot (Chokhmah, Binah and Da'at) describe three levels of conscious Divine Intellect.