There are so many styles to choose from, not to mention the types of windows. Check out this article called Window Style Options to Choose From.
These windows open in every way you can think of; hinged at the top, the bottom or the side; sliding vertically or horizontally, and then there is the fixed window – which as its name implies, does not open at all.
The article doesn’t even get into the R-rating of the window, something you also need to take into consideration, as heating costs rise.
So, check out the article and get some great ideas on how to improve the appearance of your home, and add some ventilation with several of those operable windows, as well!