Joss is a special kind of incense that people burn during religious ceremonies or to add a nice smell to a room. It's usually made from herbs or tree bark that are dried and ground up into a fine powder. Then, the powder is mixed with water and shaped into little cones or sticks.
When people light joss, it creates smoke and a pleasant smell that can help people feel calm and peaceful. Some people believe that burning joss can also help protect them from bad spirits or bring good luck.
However, it's important to be careful when burning joss because the smoke can be harmful if you breathe it in too much. That's why people often burn joss outside or in well-ventilated areas.