Organic Chemistry is the study of carbon compounds. Carbon can form a wide array of compounds, because of its size and ability to form covalent bonds with other carbon atoms. In addition, carbon can form bonds with many other elements. This property of carbon increases the facility of forming multitudes of different compounds. The particular electronegativity of carbon also plays a key role in its versatility. In this chapter, we will review some of the fundamental aspects of carbon atom and the main types of hybridizations involving carbon compounds.