Essential oils are concentrated plant extracts that are used for their therapeutic properties. They are derived from various parts of a plant, such as the flowers, leaves, stems, and roots. The oils are extracted from the plant through a process called distillation, which involves heating the plant material and capturing the resulting steam. The steam is then cooled, and the oil and water are separated, resulting in the essential oil. 

Essential oils have been used for thousands of years in traditional medicine for their healing properties. Today, they are used in a variety of ways, including in aromatherapy, massage therapy, and as an ingredient in personal care products. 

Each essential oil has its own unique chemical composition and therapeutic properties. Some of the most commonly used essential oils include: 

• Lavender: Known for its calming and relaxing properties, lavender oil is commonly used to reduce stress and anxiety. 

• Peppermint: Peppermint oil is known for its refreshing and invigorating scent and is often used to boost energy and alertness. 

• Tea Tree: Tea tree oil is known for its antimicrobial properties and is often used to help fight off infections and illnesses. 

• Eucalyptus: Eucalyptus oil is known for its anti-inflammatory properties and is often used to help relieve pain and soreness. 

• Rose: Rose oil is known for its uplifting properties and is often used to help reduce feelings of depression and anxiety. 

It is important to note that essential oils should always be used in dilution, and some essential oils should be avoided during pregnancy or by people with certain medical conditions. It is always best to consult a qualified healthcare professional before using essential oils for any therapeutic purpose. 

In conclusion, essential oils are concentrated plant extracts that are used for their therapeutic properties. They are derived from various parts of a plant, and each oil has its unique chemical composition and therapeutic properties. They are used in a variety of ways, including in aromatherapy, massage therapy, and as an ingredient in personal care products. However, it's important to use them safely and always consult with a healthcare professional before using them.