Hey Reader, Here is your Tip of the Week from EngageClass! We sincerely hope that we will once again help you do more with WebEngage with our latest tip. We hope you enjoy reading this one! Identify Unknown/Anonymous Users & Known Users: Don't worry about sending duplicate campaigns to your users
Problem StatementAll the users who visit your website for the first time or download your app without signing in are assigned a unique ID on the WebEngage dashboard so that you can track their activities and engage with them further. However, many of these users are the ones who are Unknown or do not perform any event through which their identity or user data can be collected. But they still might perform a set of actions that are important to track for your business. So how can you track these Unknown users without knowing who they are? We've got you covered! 🙂 The Unknown users' details are tagged to their respective profiles once they are recognized as known users. They are also assigned a unique identity. That's where the function of CUID & LUID comes in. Let's see how it works!
How do the CUID & LUID functions work?Every user is assigned a new LUID (Logon user ID) each time they visit your app/website from a new device. This way, all their activity is tracked anonymously in a new 'Unknown User' profile with all the data tracking points possible at that level.
As soon as the user fulfills the criteria to qualify as a 'Known User' (by signing up/logging in), they are assigned a one-time CUID (Customer user ID). This CUID is then mapped with their LUID to ensure all the past data points captured anonymously are merged to their new 'Known User' profile. Also, note that a single user can have several LUIDs in the past, but a CUID is a one-time token and is only assigned to a 'Known User' profile just once in their lifetime. Want a better perspective? Let's understand this concept through a simple use case: DAY 1A user downloads your app on her iPhone and starts browsing without logging in or providing any details. An LUID is instantly assigned to this user and an 'Unknown User' profile is created on the WebEngage dashboard. This way, all her actions are tracked by WebEngage. DAY 2The same user comes back on your app, but this time she downloads the app on her iPad. Again, she doesn't log in or provide any details about herself, which would reveal her identity. In this case, also, the user again is assigned a new LUID. DAY 3The user comes back on the app again from her iPad. She finally adds a few products to the cart and checks out. While checking out, she submits her Email ID, Mobile number, Card details, and so on. This is when a CUID is assigned to the user. Later, when the user logs in from her iPhone (used on Day 1) to check the order status, she is recognized as a 'Known User' in the WebEngage database. This CUID is a one-time ID. By passing this CUID, the WebEngage system automatically tags the latest data of the same user corresponding to the previously assigned LUIDs. In short, the latest data of the user before becoming a Known User on the platform is merged and populated against the same known profile now. 
We have done this little innovation to provide you the closest 360-degree tracking of your users so you don't end up sending duplicate campaigns. At WebEngage, we believe that every action that your users perform is essential for your business to track, and you should not miss out on any possibilities. Now that you know how Unknown and Known users are identified on the WebEngage dashboard, you can create the right campaigns for the right audience 🙂 • • • Found this useful? Share it with your peers!
Got questions? Please feel free to drop in a few lines at support@webengage.com or get in touch with your Account Manager in case you have any further queries. Happy Engaging! 
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