Viral marketing tries to make sharing the primary distribution channel. Instead of paying for every impression, the brand creates something people want to pass along. A funny video, a surprising stunt, a useful tool. If it spreads, the cost per view collapses.

Nobody can guarantee virality. Plenty of expensive campaigns disappear without a trace while a homemade clip reaches millions overnight. What brands can do is lower the friction: make content short, emotional, and easy to share.

What tends to spread

• Humor that feels genuine, not corporate
• Surprise and novelty
• Strong emotional reactions, positive or outraged
• Content that makes the sharer look good

The downside is control. Once something spreads, the brand cannot steer the conversation. A campaign meant to be playful can be read as offensive, and the audience decides which version wins.