Ideal Customer Profile (ICP) is a description of the type of company or customer that gets the most value from a product — and is therefore most likely to buy, stay a customer, and expand their spend over time. It's usually defined by firmographics (company size, industry, revenue) and behavioral signals (existing tools they use, the problem they're trying to solve).
Why ICP matters
A tightly-defined ICP focuses sales and marketing spend on the accounts most likely to convert and succeed, instead of chasing every lead that shows interest. Deals that fall outside a company's ICP tend to churn faster, need more support, and expand less — even if they were easy to close in the first place.
ICP vs. TAM
ICP defines who to target; Total Addressable Market (TAM) estimates how big that opportunity is. A narrow, well-fitting ICP inside a large market is usually a better growth engine than a broad ICP that includes customers who churn quickly.