Inertia is a property of mass that manifests during acceleration, as illustrated by everyday experiences like sudden car turns. Current discussions among physicists explore whether a deeper understanding of inertia exists, particularly in light of concepts like the Higgs field and Mach's principle. While Newton's laws provide a foundational framework, the principle of least action offers a more profound derivation of these laws. The nature of inertia raises questions about its fundamental origins, with some suggesting it may be a relationship between matter and spacetime rather than a property of mass alone. Ultimately, inertia remains a complex and intriguing aspect of physics that intertwines with various fundamental principles.