Aliphatic hydrocarbons are organic compounds made up of carbon and hydrogen atoms arranged in straight or branched chains. They can be classified into three main types: alkanes, alkenes, and alkynes. Alkanes, like methane and octane, have single bonds, while alkenes, such as ethylene, contain at least one double bond. Alkynes, like acetylene, have at least one triple bond. These compounds are commonly found in fuels, lubricants, and various industrial products. Aliphatic hydrocarbons are important in everyday life, as they serve as the building blocks for many chemicals and materials, contributing to the production of plastics and other essential items.