Now a days Cyber Crime is the most significant challenges in India. Cyber Crimes are generally referred as criminal activities that use computers or networks. It can range from fraud to unsolicited emails (spam). It can include the distant theft of government or corporate secrets through criminal trespass into remote systems around the globe. Characteristics and nature of Cyber Crime is important in helping research communities find ways to effectively prevent them. The internet is the electronic information ?eld for such crimes. Such crimes have no space or time limitations and, naturally, there are no moral or legal barriers to them. Now it is a crucial challenge to us because day by day cyber crime is gradually increases. This paper provides a survey of Cyber Crimes that have actually occurred. The threat from Cyber Crime is multi-dimensional, targeting citizens, businesses, and governments at a rapidly growing rate. Cyber Criminal tools pose a direct threat to security and play an increasingly important role in facilitating most forms of organized crime and terrorism. This paper introduces some approach to prevent the various Cyber Crimes. To avoid Cyber Crimes there are many ways like, know how to recognize phishing, know the pitfalls of public Wi-Fi, use credit cards rather than debit cards etc. are discussed.