What is Smart Contracts

IoT provided a unified operating picture across a wide range of modern-day applications. The operating image is accomplished thanks to improvements in wireless sensor network devices that can interact over a network, exchanging data and executing various analyses. The only way to share information and authenticate data in the internet of things is through a central server, which raises security and privacy problems. Device spoofing, incorrect authentication, and a lack of data exchange dependability are all possibilities. A central server idea is abolished, and blockchain technology is used as part of IoT to solve such security and privacy problems. This chapter examines the potential security and privacy concerns associated with component interaction in the internet of things, as well as how the distributed ledger-based blockchain technology might help. Here, in this chapter, the authors discuss the application of BC to certain areas and categories. Various IoT and IoT with BC problems were also highlighted in order to better comprehend blockchain technology's role.