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Smart sensors play a significant role in detecting any chemical or physical change and automating the device after processing the collected data. The effectiveness of a smart sensor system is decided by its ability to integrate various types of sensor components and establish communication between different components without requiring human intervention. There are a variety of smart sensors which can sense the changes temperature, proximity, chemical environment, humidity, pressure, motion, etc. Various sensors are used for multiple applications to enable a smart environment. It picks input signals from the surrounding environment and performs the predefined functions after detecting specific inputs using inbuilt resources. The evolution of smart sensing tools emerged...

Ferrite is a metal oxide with the formula XFe2O4, where X is a divalent metal such as Fe, Ni, Co, Cu, or Mg. Ferrite nanoparticles (FNPs) have undergone several studies to find their electrical and magnetic properties and to exploit them for nanotechnological applications. In recent years, FNPs and composites have received considerable interest because of their applications in various sensing. Due to the abundance of literature on synthesis methods, we will focus exclusively on the widespread application of FNPs in sensor systems. In this chapter, we will discuss the different sensor systems and recent developments. The classification of sensors according to their underlying sensing processes is not currently explained in any review work. In this chapter, we start with an overview of FNPs. This is followed by a discussion of the various sensing principles, including electrochemical, optical, piezoelectric, and magnetic, including their application in gas sensors, biosensors, chemical sensors, temperature sensors, stress sensors, and giant magnetoresistance sensors. In addition, we will discuss the role of FNPs in the development of biochemical sensors based on SERS. At the end, we will discuss the difficulties, prospects, and our conclusions.