Post Slugs
If you're using Pretty Permalinks, the Post Slug is the title of your article post within the link. The blogging tool software may simplify or truncate your title into a more appropriate form for using as a link. A title such as "I'll Make A Wish" might be truncated to "ill-make-a-wish". In WordPress, you can change the Post Slug to something else, like "make-a-wish", which sounds better than a wish made when sick.