Put yourself in the shoes of someone who just received a push notification, or you were browsing a torrent website to find a movie to watch on Friday night. A message pops up
"Win $500...". You weren't looking to enter sweepstakes and win prizes; you had other plans. Your intent to complete that offer is very low. You might even wonder why you're even being offered to win so much money.
Now imagine you received a notification that says
"Congratulations! You're 1 of 10 users selected to win $500. Just complete this 3 question survey about XYZ, your favorite company". Or maybe,
"find the $500 cash in the box and it's yours!".
Both of these examples are what we call angles. Angles allow you to position the offer as a necessity for the end-user. They'll help you convert more users, making you more money. While this can somewhat be done with an ad format that has creatives (push, native, etc.), it all really only comes together when you also have a landing page reinforcing the same angle of the creative.