Incense is the name for biological derived material, such as manure (ahum), bark, cotton, which is infused with aromatic oils and releases fragrant smoke when burned. The word incense refers to the material itself, rather than to the aroma that it produces. Incense is used for a variety of purposes, including the religious ceremonies, to overcome bad smells, repel insects, enhance spiritual experiences during meditation and for pleasure.
I use incense for the meditation in Surrey, to cleanse the room and help my clients and students to feel calmer, the moment they enter. I love the smell of this incense; it is the original one that is used in the ashrams in India.