In 23.578, which digit is in the tenths place? Count from the decimal point, then read that column. The answer is the digit itself, not what it is worth. For the value, use value of a digit. Number Explorer lists many other facts about a number.
Places run from millions down to millionths. An empty column is the digit 0.
The answer is one digit, from 0 to 9. It is not the value of that column.