Essential oils are basically compounds made from plants. They are specially extracted to capture the flavour and scent of these plants. This gives them unique and aromatic features. Manufacturers can produce essential oils through mechanical techniques or distillation. After the extraction, they are mixed with a carrier oil for the final products that are ready for use. 
Essential oils are mainly used in aromatherapy. In this practice, you will breathe in the compounds in different ways. The chemicals in these oils can interact with the body and provide certain health benefits. Certain plant chemicals can be absorbed when applied to the skin. Studies have shown that inhaling their aromas may stimulate the limbic system in the brain, which is important for long-term memory, sense of smell, behaviors, and emotions. This brain area also regulates blood pressure, heart rate, and breathing. That’s why essential oils can also have some physical effects on the body.