A business plan for investors is a document used to communicate a startup's market, model, traction, team, and capital ask to potential funders. It is most often delivered today as a 10 to 15 slide pitch deck plus a one-paragraph elevator narrative and (sometimes) a longer narrative memo, rather than as the traditional 30 to 40 page business plan document. It differs from the general-purpose business plan in audience and intent: this version is built to raise capital, not to align internal teams or satisfy a bank.
The components investors look for, in order of weight at early stage, are: the problem and the customer (specific, painful, big enough to matter); the solution and product (what you built, why it's diff...