What's the difference between wal-mart, and dollar stores?

What's the difference between Wal-Mart and Dollar Stores?
Would it be the quallity, or prices?

Wal mart has slightly higher quality products. Not everything from the dollar store is crap(an example would be paper plates...dollar store paper plates are the same as everywhere else, just cheaper at the dollar store)

I don't have a lot of money, so I tend to shop wherever prices are cheapestm be it the dollar store, wal mart, k mart. Depends on what I need, and if it being lower quality is worth the cheaper price or not.

I think both b/c at wal-mart you have everything, not so much at dollar stores.

WALL MART IS ALL GOOD STUFF AND THE DOLLER STORE IS CRAP ITS SUCKS