Instagram Reels is short-form video (15-90 seconds) optimized for entertainment, education, and virality. You film vertically, add trending music, text, effects, and post. Instagram's algorithm heavily promotes Reels (prioritizes them over static posts). A successful Reel can reach 100k+ viewers. A weak Reel reaches 1000. Strategy: Hook in the first 3 seconds, use trending audio, provide value (education or entertainment), add CTA (follow, comment, share, link in bio).