On hacker news often you want to show what you've been working on, including a new company you've launched, so you preface the title with Show HN: and then people know this is something you created (which I infer by your name theworded) and it also attracts some interest because people often want to see what cool things other users of hacker news have made.
Interested readers of hacker news will make suggestions as to improvements to design, service, monetization ideas.