This document provides information about transmission lines presented by Patel Shivam to an electrical engineering class. It begins with an introduction to transmission lines and defines them as electrical lines used to transmit electrical waves. It then describes four main types of transmission lines: open-wire lines, cables, co-axial lines, and waveguides. For each type it provides advantages and disadvantages. The document concludes by explaining the four main transmission line parameters: inductance, resistance, capacitance, and conductance, defining each and describing their role in transmission lines.