Cybercrime is a complex and ever changing phenomenon. Cyber criminals are becoming more sophisticated and are targeting consumers as well as public and private organizations. Therefore, additional layers of defense are needed. Cybercrime has been increasing in complexity and financial costs since corporations started to utilize computers in the course of doing business. Some of the case studies of cybercrime include Parliament attack case. In this paper, the authors have discussed about Cybercrime and cyber security and different cybercrimes that they come across and prevention techniques and detection techniques such as Tripwires, configuration checking tools, Honey Pots, anomaly detection system and operating system commands.