Crystallography is the experimental science of determining the structure of materials and the three-dimensional arrangement of atoms in molecules. This book systematically covers the basics of crystal structure and their organization. All chapters have been amply illustrated to enable ease of understanding of this highly complex subject. To appreciate the use of crystallography in determining the three-dimensional crystal structure of molecules, SHELX programme with relevant plotting routine has been elaborately dealt with. Solved examples and exercises provided would be helpful to the students to have a good understanding of this subject.