Incense makes nice smells. 

Incense is made from plants. 

Some incense burns on its own. You light it with a flame. It can be a cone or a stick. Some sticks have a bamboo core. 
Other incense needs extra heat. You can use glowing coals for this. Some people use resins or oils. This can make a nice scent.
Long ago, people in Sudan used incense. In Egypt, people used it to smell good. People in China used it for rites. It was very important to them.
Many people love these smells today. It is a very old tradition.
Incense is a material that smells good when it burns. 

There are two main ways to burn incense. Direct-burning incense is lit with a flame. It can be a cone or a stick. Some sticks have a bamboo core. These are called cored sticks.
Indirect-burning incense is different. It cannot burn on its own. It needs a heat source like glowing coals. People often use resins for this. Frankincense and myrrh are famous examples. 
People have used incense for a very long time. Ancient people in Sudan used incense burners. In China, people used herbs like sandalwood for ceremonies. In Japan, nobles used special scents for fun. It is a beautiful part of many cultures.
Incense is a special material that smells wonderful when it burns. 

There are two main ways to use incense. The first way is called direct-burning incense. 
Making incense involves mixing fragrant plant materials with other things. 
Humans have used incense for thousands of years. Some of the earliest incense burners were found in Sudan from the A-Group culture. These date back to around 3300 to 3000 BCE. In Ancient Egypt, people used incense to make rooms smell better. They also used it in religious ways to please their gods. In China, people used herbs like sandalwood and cinnamon for ceremonies during the Zhou dynasty.
Incense has connected many different people through trade and tradition. 

Incense is an aromatic biotic material that releases fragrant smoke when it is burnt. 

To understand how incense works, one must look at its two main types. The first is indirect-burning incense, also called non-combustible incense. This material cannot burn on its own and requires a separate heat source, such as charcoal or glowing embers. The second type is direct-burning incense, or combustible incense. This is lit directly by a flame and then fanned or blown out. This leaves a glowing ember that smoulders to release a smoky fragrance.
Direct-burning incense requires a specific composition to ensure it burns evenly. It is made from a moldable substrate of finely ground fragrant materials and an odourless binder. Some makers use a fuel and oxidizer mixture. In these cases, charcoal or wood powder acts as the fuel. An oxidizer, such as potassium nitrate or sodium nitrate, helps sustain the burn. This allows the incense to propagate a steady ember that can even be used to mark time. 
Other makers use natural plant-based binders instead of chemical oxidizers. These include gums like gum arabic or gum tragacanth. Another method uses mucilaginous material derived from botanical sources. This sticky substance is mixed with fragrant materials and water to hold them together. The dry binding powder usually makes up about 10% of the finished incense's dry weight. Examples of these powders include Makko, which comes from the bark of trees in the genus Persea. Other regional powders include Jigit from India, or Laha and Dar from Nepal and Tibet.
Incense takes many different physical forms depending on the culture. Direct-burning incense can be shaped into a coil, which can burn for hours or even days. 
History shows that humans have valued incense for thousands of years. The earliest documented use comes from the ancient Sudanese. Archaeological finds at Qustul in Lower Nubia include incense burners from the A-Group culture dating to 3300–3000 BCE. In Ancient Egypt, incense was used for both practical and mystical reasons. It helped obscure bad smells and was believed to appease gods or deter demons. In China, incense use became widespread during the Xia, Shang, and Zhou dynasties.
Incense has played a massive role in global trade and social history. Trading these materials was a major part of commerce along the Silk Road and the Incense Route. In Japan, incense traditions evolved through different eras. Korean Buddhist monks brought it to Japan in the 6th century for purification rites. By the Heian Era, the high-quality Japanese incense known as Koh became a form of entertainment for nobles. During the 14th-century Ashikaga shogunate, samurai might perfume their armor to project an aura of invincibility. 
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