# User Identification Feature Overview > **SUCCESS** > > **User Identification** > > User Identification is a powerful feature of Ptengine Experience that enables you to capture and leverage custom user attribute data. > > By utilizing this feature, you can deepen your understanding of users and develop more effective marketing strategies. > > 🔒 Note: You must respect user privacy and handle data appropriately. ## Benefits 💡 Link anonymous users with identified users Anonymous user ID (device ID) ``` Identified user ID (e.g., login account ID) ``` Accurate user behavior tracking Detailed user segmentation Delivery of personalized content ## Specific Use Cases 🚀 Converting anonymous users to identified users Collecting attributes of identified users ### Attributes Collected by Default Last active date Registration date Total number of sessions Referrer domain at first visit Referrer URL at first visit ### Uploading Custom Attributes Name Phone number Gender Age Interests Member tier Other CRM or database information 📊 By integrating online and offline data, you can build more detailed user profiles. ## Usage Examples 🌟 Using on sites with login functionality: User identification using unique IDs Approach by user segment ``` Anonymous users: Login incentive campaigns Identified users: Delivery of personalized information ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://helps.ptengine.com/en/experience/setting/user-identification.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.