A string is a sequence of characters. A string is like a data type storing a sequence of data values, usually bytes, where these usually stand for characters. That means that binary string and byte string are used to describe strings where the data they store but does not have to be text.
Integer variables are variables that must take an integer value; a whole number like 1 or 2. A special kind of integer variables is binary variables. Integer variables however will make the program more complex, making it take more time to solve things..
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