This document describes designing and building an OR gate circuit using diodes, LEDs, resistors, and toggle switches. It begins by stating the aim to understand how an OR gate works using p-n junction diodes and to build a circuit. It then provides an introduction to OR gates and their truth table. The rest of the document details the components used, theory of operation, the circuit diagram, and how the circuit works for each combination of switch inputs. It concludes that the output matched the expected truth table.