Single oils include only one ingredient - *one* pure essential oil free from fillers and contaminants. They can be used in cleaning, to brighten moods, as well as very specific ailments.
Oil blends are very specific and carefully crafted recipes that include a mixture of many single oils. They are made for a specific purpose and usually target a smaller number of functions to achieve a desired affect.
Carrier oils are applied in conjunction with an essential oil. They dilute the essential oil to make it safer to use, as well as making your essential oil go further! A general rule is to use 1 Tablespoon of carrier oil along with 3-5 drops of essential oil.
Diffusers are used to disperse essential oils into the air we breathe. This is a very effective mode for exposing our whole family or office at work to essential oils in a very safe and gentle way. You can use it for medicinal purposes, or to just lighten the air with a sweet smell to be more inviting to those around us.