The Internet is one of the fastest-growing areas of technical infrastructure development. In today’s business environment, disruptive technologies such as cloud computing, social computing, and next-generation mobile computing are fundamentally changing how organizations utilize information technology for sharing information and conducting commerce online. Today more than 80 percent of total commercial transactions are done online, so this field required a high quality of security for transparent and best transactions. The scope of Cyber Security extends not only to the security of IT systems within the enterprise, but also to the broader digital networks upon which they rely including cyber space itself and critical infrastructures. Cyber Security plays an important role in the development of information technology as well as Internet services. Our attention is usually drawn on “Cyber Security” when we hear about “Cyber Crimes”. Our first thought on “National Cyber Security” therefore starts on how good is our infrastructure for handling “Cyber Crimes”. This paper focus on cyber laws and security emerging trends, issues and challenges while adopting new technologies such as mobile computing, e-commerce, and social networking.