Fragrance oils are typically used in perfumes, colognes, candles, diffusers and house cleaning products. These oils provide a very attractive aroma to the product they are used for. Fragrance oils are used to give a lovely and appealing scent to a room or product. They can make a space very welcoming and inviting and the whole atmosphere more relaxing. These oils are very easy to use. Most people use them to make their products more appealing to the senses since fragrance oils can give you the exact scent that you want.