Some popular essential oils include lavender, peppermint, and eucalyptus. Lavender oil is known for its calming and soothing properties, making it suitable for promoting relaxation, improving sleep quality, and relieving stress. Peppermint oil has invigorating and cooling properties that are beneficial for boosting energy, improving focus, and providing relief from headaches or muscle pain. Eucalyptus oil has a fresh, stimulating aroma with respiratory and immune-boosting benefits that make it popular for addressing colds, congestion, and sinus issues.