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Nectar
A Nectar Feeder dispenses sugar water (nectar), and is most often directed at feeding Hummingbirds, but there are nectar feeders that are designed to feed Oriloles too.  Hummingbird feeders most often have some red on them, because Hummingbirds are attracted to that color, and are apt to find a feeder faster with that color clue.  The sizes and shapes of Hummingbird feeders are almost mind boggling, but if you're just starting out trying to attract Hummers, I'd stick with a feeder that only holds 8 or 10 ounces of nectar.  You do have to change the nectar every 2 to 3 days, so to have one that holds a lot of nectar would be a waste until you see how many of the little jeweled wonders you'll attract.
 
If you're interested in attracting Orioles you might want to invest in a nectar feeder especially designed for them.  This is generally a bigger feeder, with perches, and most often has some Orange on it.  Orange is supposed to attract Orioles rather than the red of a Hummer feeder.
Ruby Throated Hummingbird
Window Feeders

A window feeder is a lot of fun because you get to see the birds up close and personal.  There are small suction cup feeders, usually made out of clear plastic, that are very easy to attach to a window, and there are bigger feeders that fit right into your window casement.  One thing to remember with a window feeder though is unless you can put the feeder smack dab in the middle of a large pane of glass, as in a suction cup type, you're liable to end up with squirrels eating out of it too.
Squirrel at window feeder