Trackbacks are used to notify authors of other blogs that you’ve referenced them or wrote something similar in an article you authored. You don’t necessarily have to link to an article to send a trackback. You can find the option to send a trackback
at the bottom of each new post. Just copy and paste the link to another article and you’ll send a trackback. Trackbacks are often overlooked as it is just easier to send a pingback than a trackback.
Pingbacks occur when you link to an article on another blog. The author will receive an email notification that you published a post that links back to one of their own previously published works. Pingbacks are commonly seen in the comments section of an
article. They link back to the newly published article. Pingbacks differ from trackbacks because you have to actually link to the article within your post to notify the author.
Looks like a reasonable definitions to me.