Explore the fundamental role of Quantum Field Theory in modern physics through this insightful 35-minute lecture by Nathan Seiberg at the International Centre for Theoretical Sciences. Delve into the evolution from classical physics to quantum mechanics, understanding how Quantum Field Theory has become the universal language of physics. Compare the limitations of calculus with the expansive capabilities of QFT, and examine various presentations of the theory, including the abstract approach and Lagrangian formulation. Discover the strengths and weaknesses of current QFT models, and consider the potential need for reformulation. Conclude with a thought-provoking Q&A session, gaining a broader perspective on this cornerstone of theoretical physics.