PHP Symbol Meaning

I have a question which is probably pretty basic to most PHP programmers. What is the => symbol for in PHP? For example if I have an array cookie set up:

setcookie ("FBPoolCookie[userID]",$row['sqlUserID'],time()-3600);
setcookie ("FBPoolCookie[userTeamID]",$row['sqlUserTeamID'],time()-3600);

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I can run this code and get all the cookie array values:

foreach($_COOKIE["FBPoolCookie"] as $tempVar) {
	echo($tempVar . "<br />");
}

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But if I run this it will give me the of the current cookie array names and their respective values:

foreach($_COOKIE["FBPoolCookie"] as $tempVar => $value) {
	echo($tempVar . $value . "<br />");
}

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So clearly the => has some sort of special meaning but I am not sure what it is. I was trying to google it but search engines and web sites do NOT like the => symbol for searching.