Pingback allows you to notify different bloggers that you have linked to their article on your website. There are some small technical differences a trackback is the same things as a pingback.
If the other blogger has a pingback enabled website, then they can see a notification that you have linked to their article. They can then choose to allow your link to appear on their website.
You can choose for allowing or disallowing pingbacks in the Discussion Settings of your Administration Panels. If you see the box labeled “allow link notifications from other blogs” then you will receive trackbacks when different authors linking to your content. These will always appear in your admin panel where you would normally find comments.