Cyber security is a information technology. Securing information has become one of the biggest challenges nowadays. Whenever we think about cyber security the first thing we remember is ‘Cyber Crime’which is been increasing day by day. The cyber security is still a very big concern to many. This paper mainly focuses on challenges faced by cyber security and its types. To the world of computer technology, governments, police and intelligence units are acting toward the issue closely. Different strategies are put into action. The main goal is to educate the people in the world and to expose the idea that it is not safe anymore to navigate in the cyber world without any of security. This paper discuss about techniques used in cyber security.