Define Your Market Boundaries

My product: [product] built for [target audience] to solve [problem]

Help me define the market I'm actually in — not too broad, not too narrow.

1. **Category**: What is this product called? What's the realistic size of that category (your best estimate for relevant geographies)?
2. **Substitutes**: Everything a user could use instead of my product — including options from completely different categories
3. **Adjacent markets**: Markets I'm not targeting today but could expand into as the product matures
4. **Out of scope**: What is clearly NOT my market, and why drawing that line matters

Be honest about the size. Founders consistently overestimate their addressable market — help me get this right.