Divider bars are thin to thick lines that divide certain parts of your hubs into sections. There are many types of divider bars, from coloured ones to ones with patterns etc. I don't use them that often, since the staff discourages them. I have used them on one of my hubs, perhaps the image below will explain them better.
Try searching HubPages for hubs about line dividers, you can make your own too using the Snipping Tool if you have Windows. There are hubs that include line dividers made for you to copy and use in your hubs, always remember to add attribution. The line divider in the image below is used, with permission from Sharkye11, a Hubber here on HP.
