Definition
Customer data platform (CDP) software ingests customer data from multiple sources - your product, your website, your CRM, your support tool - and resolves it into a single, persistent profile per customer that other systems (an ESP, a CEP, an ad platform) can then query or activate against. A CDP does not itself send marketing messages; it makes the data usable by the tools that do.
CDP vs CRM
| CRM | CDP | |
|---|---|---|
| System of record for | Sales and account relationships - deals, contacts, tickets | Behavioral and event data across every customer touchpoint |
| Who typically owns it | Sales / support teams | Marketing / data teams |
| Update pattern | Manual entry and workflow-driven updates | High-volume, largely automated event ingestion |
The two are complementary, not substitutes: a CRM without a CDP has clean account data but a shallow, delayed view of behavior; a CDP without a CRM has rich behavioral data but no sales-relationship context. Where budget or maturity only supports one, the right choice depends on whether the immediate problem is sales visibility or marketing activation - see our do-you-need-a-CDP use case for that decision in more depth.
Composable CDP vs packaged CDP
A packaged CDP is a single vendor product covering ingestion, identity resolution, and activation together. A composable CDP is the same job assembled from separate best-of-breed pieces - a data warehouse for storage, a reverse-ETL tool for activation, an identity-resolution layer in between - wired together rather than bought as one SKU. Neither is objectively better: composable trades a lower licensing cost and more architectural control for real integration engineering overhead, a trade-off worth thinking through on our composable martech page before deciding.
Where Segment and Salesforce CDP fit
Segment is commonly evaluated as either a packaged CDP or the ingestion layer inside a composable stack, depending on how it's configured. Salesforce CDP (Data Cloud) is typically evaluated by organizations already committed to the Salesforce ecosystem, where native integration with Salesforce CRM and Marketing Cloud outweighs the cost of a best-of-breed alternative. Neither is covered here as an endorsement - both are named because they are the two vendors buyers most often compare against a general CDP purchase.