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Answer Posted / shah faisal
Hash is an unordered pair of keys and values where keys
must be unique else the second duplicate keys replace the
value of first key. Hash is denoted by a "%" sign.
e.g.
"key1"->"value1","key2"->"value2",key1"=>"value3" then
final hash will be %hash=("key2"-
>"value2","key1"=>"value3");
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