[SaginumaEki]

や is what MMM said. It's when you have a list. It's almost like し。

Like you can say:

今日は楽しかったし、きれいだった。Today was, umm, fun and umm clean. Shows unexclusivitiy and stuff.

or

今日は楽しくてきれいだった。Today was fun and clean.

(I just used random words. You get the picure.)