Citronella oil is an essential oil extracted from the leaves and stems of various species of citronella grass, particularly Cymbopogon nardus and Cymbopogon winterianus. Here's a concise overview:

1. **Aroma**: Citronella oil has a fresh, citrusy, and slightly fruity aroma with grassy undertones. Its fragrance is uplifting and invigorating, often used to repel insects and refresh the air.

2. **Insect Repellent**: Citronella oil is best known for its natural insect-repellent properties. It contains compounds like citronellal and geraniol, which are effective at deterring mosquitoes, flies, and other flying insects. It's commonly used in candles, sprays, and diffusers to create a bug-free environment outdoors.

3. **Aromatherapy**: In aromatherapy, citronella oil is valued for its refreshing and uplifting effects on the mind and body. It can help reduce feelings of fatigue, promote mental clarity, and enhance mood when diffused into the air or used in massage blends.

4. **Antifungal Properties**: Citronella oil has mild antifungal properties and may be used to combat fungal infections of the skin, such as athlete's foot. It can be diluted and applied topically to affected areas to help alleviate symptoms and promote healing.

5. **Cleaning Agent**: Citronella oil is sometimes used as a natural cleaning agent due to its antiseptic properties. It can help disinfect surfaces and neutralize odors when added to homemade cleaning solutions.