General
Moat
A lasting advantage that makes it hard for competitors to copy or beat you — like a strong brand, network effects, or unique technology.
Example
WhatsApp's moat is that everyone you know is already on it (a network effect).
Related terms
Product-Market Fit
The point where you have built something a specific market really wants — shown by strong retention and users who would be upset if it disappeared.
Virality (K-factor)
How much your users bring in new users by themselves. A K-factor above 1 means each user brings more than one new user — organic, self-fuelling growth.
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