Essential oils (EOs) are strongly scented, complex, volatile, naturally occurring metabolites that aromatic plants form. The primary chemicals found in EOs exhibit antioxidant, antimicrobial, and antifungal properties, which enable these oils to enhance the shelf life and safety of food. The bioactive properties of EOs are generally determined by their major constituents. The biological activity of EOs is comparable to that of synthetic pharmaceuticals. However, using EOs in the food or pharmaceutical sectors as supplements, preservatives, or antioxidants requires further research. Certain chemical additives and synthetic preservatives are toxic and can cause cancer and other degenerative disorders. Therefore, new solutions for food preservation are currently being developed. Moreover, consumers are becoming increasingly concerned about their health and are opting to purchase healthier goods with natural ingredients and preservatives rather than those containing artificial ones. Therefore, it is necessary to find natural substitutes that are antibacterial and compatible with food. Here, we reviewed the phenolic chemicals of EOs because these are typically responsible for their antioxidant and antimicrobial properties. In addition, we examined the main bioactive components of various types of EOs along with their pharmacological, antibacterial, antifungal, and antioxidant properties relevant to food preservation. In addition to improving food's shelf life and safety, certain types of EOs derived from different traditional plants have superior antibacterial and antioxidant activities. The main classes of EOs are terpenes and aromatic volatile chemicals, enhancing food safety without compromising quality. Their numerous properties enable EOs to serve as substitutes for preservatives, thereby extending the shelf life of food products. The primary aim of this review is to explore the potential of EOs as natural, safe, and effective alternatives to synthetic preservatives and chemical additives in the food and pharmaceutical industries.