The Internet of Things (IoT) has attracted a lot of interest recently since it has fundamentally altered human life. The IoT enables information exchange in numerous applications, including smart homes, healthcare, transportation, many more. These various application fields can be combined to form the concept of "smart life".Cybercriminals and security professionals are in a race as a result of the IoT quick development. Due of the communication and exchange of potentially sensitive information across billions of linked devices. Consequently, enhancing IoT security and protecting user privacy present significant challenges. In-depth research on IoT security is the goal of this study. After examining many IoT security assaults, a classification of the security conditionsbuilt on the goals of the incidents is suggested. Corresponding to the functionareas in which they are employed, recent security solutions are also described and organized into categories. Open research questions and security issues are argued as a conclusion