Let's go through coins that actual have a functional use and real world users. No buzzword vaporware allowed. I'll start.
Bitcoin
>store of value
>decentralized, deflationary currency
>adopted by select retailers, can be used to buy things
>currently seen as the gold standard backing other cryptocurrencies
1ST
GUP
Doge coin, trump coin
>store of value
>decentralized, deflationary currency
Black market anon coins like ZEC, XMR are likewise used to buy things.
Other than that, it gets pretty hard.
I guess ETH / ETC
>enable easy ICO scams
>online casinos with odds that can be mathematically validated
>>2979311
ANT (Aragon)
I don't have time to explain. Just go to their website and download the alpha version (beta coming later this year) yourself.
ETH
>scam people out of money