Virality
Also called Viral Growth
The tendency of a product to spread from user to user as a natural part of being used, invitations, shares, collaboration, so growth feeds itself. Measured by the viral coefficient.
Why it matters
Built-in virality lowers acquisition cost and can drive exponential growth, which is why founders try to engineer sharing into the product. True virality is rare, but even a little reduces how much you must pay to grow.
For example
Every Calendly link a user sends exposes the recipient to the product, so scheduling one meeting quietly recruits the next user.
Go deeper
Related terms
Also in Starting Up
See how founders actually handle this on Growing and marketing, part of the Starting Up hub.
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