Abstract: Internet of Things (IoT) devices is rapidly becoming universal. The success of IoT cannot be ignored in the scenario today, along with its attacks and threats on IoT devices it’s facilities are also increasing day by day. Cyber attacks become a part of IoT and affecting the life and society of users, so steps must be taken to defend cyber seriously. Cybercrimes threaten the infrastructure of governments and businesses globally and can damage the users in innumerable ways. Cybercriminals use new technologies to attack, therefore secure IoT is the need of this time and understanding of attacks and threats in IoT structure should be studied. It should be ensured that security of the servers, devices, and systems been increased. Effective, fast, and easily usable antivirus and antimalware tools should be developed and popularized to overcome this global threat.This paper deals with types of threat, types of intruders faced by today’s cyber world..