As already mentioned you can declare an unordered map of any type. Let's have a unordered map named first with string and integer type.

unordered_map<string, int> first; //declaration of the map 
first["One"] = 1; // [] operator used to insert the value 
first["Two"] = 2;
first["Three"] = 3;
first["Four"] = 4;
first["Five"] = 5;

pair <string,int> bar = make_pair("Nine", 9); //make a pair of same type
first.insert(bar); //can also use insert to feed the values

unordered_map<data_type, data_type> variable_name; //declaration

variable_name[key_value] = mapped_value; //inserting values

variable_name.find(key_value); //returns iterator to the key value

variable_name.begin(); // iterator to the first element

variable_name.end(); // iterator to the last + 1 element