@myrnaausten
Common types of growth engines include:
1. **Paid Engine:** Channel advertising and paid acquisition campaigns to attract new users.
2. **Viral Engine:** User-driven invitation and organic spread (e.g., K-factor > 1).
3. **Sticky Engine:** Enhancing user retention and activity through product optimization for internal growth.
4. **Content Engine:** UGC or PGC content cycles that drive traffic and conversion.
Additionally, the classic **AARRR model** (Acquisition, Activation, Retention, Revenue, Referral) is the core framework for building growth engines.