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I've seen it used in many places, and sometimes it feels like a connection
between words.

For example in 「鳥の詩」 (tori no uta), it looks as if the の is connecting 鳥
(tori) and 詩 (uta), and I would like to know what it represents, in this case
at least.
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grammar particles particle-の
What is the significance of の in 「鳥の詩」?
My Japanese teacher taught me to think of の to mean "of" and translate the {X
no Y} as "Y of X". Her favorite example:

_**watashi no tomodachi no amerika no chizu_**  
the map of America of a friend of mine

So {tori no uta} would mean "the song of birds".
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"の" (no) can be thought of as a "general connective" in many ways just like
"of" in English, "de" in the Romance languages, "von" and "van" in German and
Dutch respectively, and "的" (de) in Mandarin Chinese.

Unlike English "of" however the items on the left and right of "の" (no) must
be switched. This makes it even more like the English possessive apostrope:

Andrew の kuruma -> car of Andrew _or_ Andrew's car.

Joining several nouns together differs between English and Japanese so often
Japanese will have to add の between two nouns that English would just put next
to each other. (And sometimes the opposite may be the case).

Even in English when you think about it there are lots of places we use "of"
which don't really indicate possession but rather just part of our idiom for
connecting nouns. The same happens with の in Japanese only it may seem more
apparent not being your native language.
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The particle の "no" is mainly used to indicate _possession_ , it's also called
the **possession indicator**. An example could be:

> 先生／私／和子の車。[sensei/watashi/Kazuko no kuruma.] ( _Teacher's/my/Kazuko's car._
> )

Or linking nouns like:

> 車のトヨタ [kuruma no Toyota] ( _Toyota the car [company]_ )

For other usages as well, see
[here](http://en.wikipedia.org/wiki/Japanese_particles#no).

I'll directly paste them from [this
site](http://www.timwerx.net/language/particles.htm#no) here:

  1. **It can sometimes replace ga, and is used especially in clauses that modify a noun:**  
Hontou ni mondai no nai tabi deshita. (It really was a trouble-free trip.)  
Watashi no oshieru gakusei wa, eigo no dekinai ko bakari desu. (None of the
kids that I teach can speak English.)

  2. **It comes after some adjectives:** Kyoto no matsuri ni takusan no hito ga ita. (Many people were at the festival in Kyoto.) Kumi wa midori no fuusen ga hoshii. (Kumi wants a green balloon.) 

  3. **It makes informal questions:** Yuushoku wa tabenai no? (Aren't you going to eat dinner?)  
Nanji ni kuru no? (What time will you come?)

  4. **And it is also used between prepositions and nouns to make the noun the object of the preposition.**

    * **Compare the following sentences:** Kono tegami wa Yuuko kara kita. (This letter came from Yuuko.)  
Kore wa Yuuko kara no tegami desu. (This is a letter from Yuuko.)

    * **And these:**  
Kono tegami o Yuuko ni okuru. (I'm going to send this letter to Yuuko.)  
Kore wa Yuuko e no tegami desu. (This is a letter to Yuuko.)

_Note:_ Ni is not used with no in this way.
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In addition to what the other says, it can also be used as an informal
question signifier.

そうなの？ _Sou na no_? "Really?" [Fem.]

なんでだめなの？ _Nande dame no_ "Why not?" or "What's wrong with it?"

何言ってんだけ分かってんの？ _Nani itten-dake wakatten no?_ "Do you know what you're
saying?"
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answer