A decimal number is one way of representing numbers where each place for a digit has a place value that is ten times that of the place to its right. Most all the numbers that you familiar with (judging from your question) will be decimal numbers. A decimal number need not be a [decimal] fraction.
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A decimal number is not an integer. An integer is a number that is not a fraction, and decimal numbers are decimal fractions.
1.30 is a decimal number
a negative decimal number, a rational number, a nice number
It is a terminating decimal.
You can't change a whole number to a decimal. A decimal and a whole number are both numbers. A decimal is just a number lower than a whole number, or a number in between two whole numbers.