Explore the fundamental concept of Z-matrix in this concise 11-minute lecture from NPTEL-NOC IITM. Gain a clear understanding of the Z-matrix structure, its applications in molecular geometry representation, and its significance in computational chemistry. Learn how to construct and interpret Z-matrices for various molecular systems, and discover their role in optimizing molecular structures and performing quantum chemical calculations. Delve into the advantages of using Z-matrices over Cartesian coordinates for describing molecular geometries, particularly for large and complex molecules.