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Almost all numbers that we use in daily life are decimal numbers. The place value of each digit is ten times the place value of the digit to its right. And that is all that is required of decimal numbers. A decimal point is not necessary.
Whole numbers are a proper subset of decimal numbers. All whole numbers are decimal numbers but not all decimal numbers are whole numbers.
Any amount of numbers can be in a decimal.
All real numbers can be represented in the decimal system. Complex numbers can be represented by a pair of numbers in the decimal system.
Decimal numbers that can be expressed as fractions are rational but decimal numbers that can't be expressed as factions are irrational