This topic introduces various operating systems available for the IoT environment. First, it introduces the various aspects of the operating system designed for the IoT environment. The entire IoT environment is based on the application of microprocessors, microcontrollers and wireless sensors. An IoT operating system is an operating system designed to work within the specific limitations of IoT devices such as size, power, and processing capacity. The IoT operating system is a type of embedded operating system but by definition it is designed to allow data transfer over the Internet. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay The hallmark of IoT is the ability of embedded systems around us to connect and communicate over a network. IoT operating systems are used to control systems in cars, traffic lights, ATMs, etc. Traditional operating systems such as Linux can be used by IoT devices. The primary choice of an operating system programming language is (i) a standard programming language, typically ANSI C or C++ (ii) an operating system specific language. Introduction:IoT is one of the emerging technologies in the IT industry. It can be defined as a network of Internet-connected devices that we use every day at home, at work and in other organizations, which will help with the interconnection between these devices. It is a network of devices connected over the Internet, so each device has its own IP address and can connect with others to perform simple tasks. It consists of actuators, sensors and computer systems that provide intelligent services. The characteristics of IoT devices are: · They are unique · Wifi Bluetooth and 3G · Cloud services · Remote control The traditional operating system cannot meet the need to provide a standard operating system and lightweight, but complex, network stack to be deployed on devices Constrained low-end IoT. Alternatively, available embedded operating systems such as contiki-OS and RIOT-OS provide support for a wide range of hardware platforms and microcontroller architectures. In this paper we first analyze the requirements for software running on IoT devices. From the analysis we understand that none of the existing operating systems are capable of meeting the requirements of IoT systems. Although efforts are made on the existing operating system for IoT, key features such as maximum energy efficiency cannot be added to the existing system, as adding such features can impact every part of the system. Secondly we will analyze, classify and compare open source operating system, closed source operating system and other software libraries.