title: What is KEYTOOL in JDK ?and what is use of it as developer?
body: <p>I heard about the keytool which is comes in JDK/bin folder and it is also used in android app when we incorporate our app to Faecbook SDK.so i don't have idea about what keytool is exactly?
  can any one help me to introduce the keytool?and where to use it and why to use it?
  Thanx in advance</p>