Essential oils, derived from raw plant materials, are complex mixtures of volatile organic compounds obtained through distillation techniques like steam distillation and hydrodistillation. Renowned for their potent aromas, these oils separate into two phases, oil and water, during extraction. Composed primarily of terpene derivatives and phenylpropanoids, essential oils are widely produced using traditional methods such as steam distillation, hydrodistillation, cold pressing, solvent extraction, and mechanical treatments. These methods are favored for their simplicity, cost-effectiveness, and scalability, despite the emergence of modern techniques. The choice of extraction method depends on factors like the type of essential oil, solvent nature, and specific process requirements, with trade-offs in yield, processing time, and product quality. While traditional methods dominate due to practical advantages, they are not without limitations. The quality of essential oils is evaluated through sensory analysis, physical and chemical testing, and advanced analytical techniques, ensuring their suitability for various applications. This chapter details conventional extraction techniques for essential oils, examining their processes, strengths, and limitations. Additionally, it explores the analytical methods used to assess oil quality, providing insights into the methodologies and criteria essential for optimizing production and ensuring high-quality outcomes in essential oil applications.