This document discusses graphene and graphite. It begins by defining graphene as a single layer of carbon atoms arranged in a hexagonal lattice. It then discusses the properties of graphite, including its layered structure, conductivity, and uses in lubricants, electrodes, and pencils. The document also covers the crystalline structure of graphite and methods for visualizing graphene using optical microscopy. Applications of graphene discussed include solar cells, batteries, and electronics. Key properties of graphene mentioned are its high electrical conductivity, strength, and thermal conductivity.