Neither, it's an irrational number which never ends or repeats.
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Decimals can be "terminating" "recurring" or "other." A terminating decimal is one which is finite. Recurring and other decimals continue on forever. For instance 0.5 is a terminating decimal. 0.729 is a terminating decimal. 0.3333333... is not a terminating decimal. pi (3.1415926535....) is not a terminating decimal.
Pi is an irrational number
pi
It is a finite decimal (i.e. one that is not infinitely recurring. Thus pi, e and root 2 are not terminating decimals).
Either terminating (as in 0.25) or non-terminating as in the expression for pi.