A hash, also known as an associative array, is a collection of data inwhich each piece of data has two components: a key and a value. Much like the hash at your local diner, JavaScript hashes go unordered: They're not indexed by numbers. For example, if you wish to use JavaScriptto put up a different GIF animation on your site every day of the week, youmight throw all these animations into a hash associated to each weekday as a key. Then you would refer to the key day to invoke that day's animation. For example, in a normal array, you'd have: dinner[0] = "monkey brain"; dinner[1] = "meatloaf"; But in a hash, you could use a string as the index: