Customer Data Platforms (CDPs) ingest customer data from web, mobile, CRM, email, and ad platforms and unify it into persistent, queryable customer profiles available to downstream activation tools. Core capabilities include identity stitching across known and anonymous touchpoints, real-time event ingestion, audience segmentation, computed traits, and direct activation into ad platforms, email tools, and personalization engines. The category spans enterprise CDPs (Treasure Data, Tealium, Salesforce Data Cloud, Adobe Real-Time CDP), composable CDPs sitting on warehouse data (Hightouch, Census), and product-led behavioral CDPs (Segment, RudderStack, mParticle).