What is the difference between a promo, a teaser and a trailer?

What is the difference between a promo, a teaser and a trailer? teaser Check out the latest teaser for Deadpool & Wolverine for another look at the upcoming MCU teaser BUS7 'แค่น้องชาย ' MV TEASER OFFICIAL MUSIC VIDEO RELEASE ON 2024 6PM (GMT+7

teaser BUS7 'แค่น้องชาย ' MV TEASER OFFICIAL MUSIC VIDEO RELEASE ON 2024 6PM (GMT+7

teaser A new teaser trailer for 'Star Wars: Outlaws' was shown at Summer Games Fest highlighting traversal, combat, and more to come  Check out the latest teaser for Deadpool & Wolverine for another look at the upcoming MCU