A repeating decimal is one in after the decimal point,
the same digit or group of digits repeats forever.
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When you convert a fraction to a decimal sometimes the decimal repeats forever. For example 1/3 as a decimal = 0.333333333.... (or 0.3 "recurring"). Another example is 1/7=0.142857142857.... (or 0.142857 recurring).
No, no repeating decimal is irrational. All repeating decimals can be converted to fractions. They are, however, non-terminating.
The bar is only used for repeating decimals. If it is repeating, you can use it.
Repeating Decimal can be expressed exactly using what
A repeating decimal is just a decimal that repeats. An example would be 6.575757... Repeating decimals are infinite.
.333333 (repeating)