To convert the fraction \( \frac{1}{9} \) into a decimal, you can divide 1 by 9.
If you perform the division, you'll find that:
\[ 1 \div 9 = 0.1111\ldots \]
The decimal expands indefinitely as 0.1 with the digit "1" repeating. Therefore, \( \frac{1}{9} \) as a decimal is:
\[ 0.\overline{1} \]
This notation \( 0.\overline{1} \) indicates that the "1" repeats infinitely.