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Key value pairs are just two items that are linked together for example,
This is a key value pair because it has a key name: and a value Me,
if you have an associative arrray:
store = ["key":"value","shoe":"shoelace","boat":"water"];
the one on the left are the keys (key, shoe, boat) and you can use keys to access values:
so key value pairs is the combination of the key and the value