Accretion disks arises when materials in universe usually being transformed from one celestial to the other object.Accretion means the collecting of additional matter.
The place that accretion disk take place is Binary stars and active galaxy nuclei.
For example consider a white dwarf that a simple star like ours rotate around it.
because of the conservation of angular momentum and gravitational pull from White dwarf to interstellar medium and sun ,spirals appear in disk.
gas become very hot in disk due to friction and being tugged on by white dwarf and eventually looses angular momentum and falls into WD.
The important of accretion disk is that the first and most common is the growth of a massive object by gravitationally attracting more matter, typically gaseous matter in an accretion disc.
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