PERFORM UNTIL vs PERFORM TIMES - when to use which?

Need a loop. Docs show PERFORM 10 TIMES and PERFORM UNTIL WS-EOF = 'Y'.

Is TIMES only when I know the count up front?

TIMES = fixed count. UNTIL / VARYING = keep going until a condition (reading a file, searching a table).

Reading a file = UNTIL eof flag. Processing exactly 12 months = TIMES or VARYING 1 BY 1 UNTIL > 12.