CMS?

So, this week's topic is Content Management Systems. I'm still trying to figure out exactly what that means in "layman's terms." So far, I'm thinking it's got to do with webpages and managing their layout, features, and the information on them. Could be wrong, though, we'll see. Anyhow, I'm looking forward to finding out more about them, and in the process getting a better understanding of widgets, plugins, and the like.