Cycles in stirling cycle numbers example

Question

I was reading about Stirling cycle numbers which count the permutations of $n$ objects that have just $k$ cycles.
An example I read mentioned the $6$ permutations of $3$ objects are classified as:
$1$ cycle: $(123)(132)$
$2$ cycles: $(12)(3)\space \space \space(13)(2)\space \space \space(23)(1)$
$3$ cycles: $(1)(2)(3)$
I am not clear what do we mean by cycles in this example?