Dumb Q - What is a cron job?

[Ramster]

In dumb man's terms (that's what I understand, LOL) a cron job is added by your host (it's always easier to ask them to do it) to the server to tell a particular script to do something at a specific time.

For example a tgp script can have a cron that will update it at midnight or 3am each and every day. As sparky said, blogs automater has one that tells the blog to update.