Guerillas are irregular armed groups that use unconventional tactics to fight. They often operate in rural areas, where they can blend in with the local population and use the terrain to their advantage, though urban examples also exist. They are distinguished by their autonomy (operating in small groups with little or no centralised command), extreme mateship (as they constantly face great threats and harsh conditions together, becoming family-like), adaptability (being usually resource-starved), and a lack of standardisation. More detailed aspects of a guerilla's culture are influenced by their history, political environment, social context, popular support, etc.