what is a decimal
A decimal is a fraction whose denominator can be expressed as 10 or some higher power of 10.
Example:
0.6, 3.57, 4.675 are some examples of decimal numbers.
Now, decimal point is the symbol used to separate the integer part of a decimal number from its fractional part.
For example: In the number 36.9, the point separates the 36 (the whole number part) from the 9 (the fractional part, which really means 9 tenths).
So 36.9 is 36 and nine tenths.