A lahar is a type of volcanic mudflow that occurs when volcanic ash and debris mix with water and flow down a steep slope, often due to heavy rainfall. The term "lahar" is derived from the Javanese language, and is commonly used to describe volcanic mudflows in Indonesia and other regions with active volcanoes. Other synonyms for "lahar" include mudflow, mudslide, debris flow, and pyroclastic flow. These terms are often used interchangeably to describe the destructive and often deadly nature of volcanic mudflows, which can cause significant damage to homes, infrastructure, and entire communities. It is important to stay informed about volcanic activity in your region and to take appropriate measures to prepare for potential lahars and other natural disasters.