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

Teaser] GMM GRAMMY OFFICIAL · 0:35 · TEASER MV ไอฟาย Feat HYE - FOOL STEP พร้อมกัน 22 Genierock · 0:30 TEASER MV หากฉันรู้มาก่อน

During Summer Game Fest a new teaser trailer was revealed for the upcoming Warhammer 40000 video game Focus Entertainment and Saber

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