Why do Jewish men wear a Kippa?

One of the hallmarks of the Jewish dress code is that men cover their heads, usually with a Kippah or Yarmulke. Why do Jewish men cover their heads? Why do we use a Kippah? Must it be worn all the time or just in the synagogue? Why don't women wear a Kippah too. A fascinating discussion about the Kippah and Yarmulke.