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		| Paper: | 
		Advection-Dominated Accretion Flows | 
	 
	
		| Volume: | 
		160, Astrophysical Discs: An EC Summer School | 
	 
	
		| Page: | 
		279 | 
	 
	
		| Authors: | 
		Yi, Insu | 
	 
	
	
		| Abstract: | 
		We review basic properties of advection-dominated accretion flows (ADAFs) and their applications to astrophysical systems ranging from Galactic binary systems to galactic nuclei. A new classification scheme for low-luminosity, X-ray bright galactic nuclei is highlighted. Some outstanding unresolved issues are discussed. | 
	 
	
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