Magnetic nanoparticles are tiny particles, typically ranging from 1 to 100 nanometers in size, that exhibit magnetic properties. These particles are often made from materials like iron oxide and can be manipulated using external magnetic fields. Their small size allows them to interact with biological systems at the cellular level, making them useful in various applications. Due to their unique properties, magnetic nanoparticles are widely used in fields such as medicine, where they assist in targeted drug delivery and imaging techniques. They also have applications in environmental remediation and data storage, showcasing their versatility in both scientific and industrial settings.