What is a cycle?

[newsalt]

Is a "Cycle" the amount of time between a water change.

 

[nm reef]

Below is a link to a very well put together article on the "cycle"...I am a low tech type hobbiest and this info is sometimes just over my head and there is no way I could address this on my own. Thankfully there are sources to help high-tech challenged folks like me.....hope the link helps you.....
<a href="http://www.reefcorner.com/Manual/nitrogen_cycle.htm" target="_blank">nitrogen cycle</a>