Different types of carbides [closed]








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I am confused between different types of carbides such as 


$\ce{CaC2}$, $\ce{Mg2C3}$, $\ce{Al4C3}$, $\ce{BaC2}$ or $\ce{BeC2}$.


And if they are different, why they are called carbides?




Carbides are a specific class of carbon-containing compound; there is not a single compound called "carbide". According to [this Wikipedia article](https://en.wikipedia.org/wiki/Carbide): 



> 
> In chemistry, a carbide is a compound composed of carbon and a less
>  electronegative element. Carbides can be generally classified by
>  chemical bonding type as follows: (i) salt-like, (ii) covalent
>  compounds, (iii) interstitial compounds, and (iv) "intermediate"
>  transition metal carbides. Examples include calcium carbide
>  ($\ce{CaC2}$), silicon carbide ($\ce{SiC}$), tungsten carbide
>  ($\ce{WC}$) (often called simply carbide when referring to machine
>  tooling), and cementite ($\ce{Fe3C}$), each used in key industrial
>  applications. The naming of ionic carbides is not systematic.
> 
> 
> 


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