The Internet of Things is causing a big revolution, which is a new reality that has replaced traditional life with modernized life. Smart objects have made our lives easy. The IoT is virtually present in every aspect of life. Much research in IoT made this possible, along with technology and electronic devices such as chips, sensors, etc. which have greatly contributed to this new revolution and helped to recognize the full potential of IoT. This paper refers to the various domains in IoT and some of their examples, as well as the detailed architecture of IoT with examples. IoT generates huge amounts of data. Hence, the role of big data and cloud computing as tools in solving IoT problems and efficient working. Some issues and challenges related to the IoT have also been discussed, such as security and privacy.