What is "when the same default tracking code is installed on pages with different domains?

When the same default tracking code is installed on pages with different domains, it may result in inaccurate data and tracking errors. This is because the tracking code is designed to track activity on a specific domain, so when it is used on multiple domains, it can lead to data being mixed or combined incorrectly.

One common issue that may arise is the tracking of cross-domain sessions, where a user's activity on one domain is incorrectly attributed to another domain. This can skew analytics data and make it difficult to accurately track user behavior and performance metrics.

To avoid these issues, it is recommended to use separate tracking codes for each domain, or to configure the tracking code to properly track cross-domain sessions if necessary. Additionally, it is important to ensure that the tracking code is placed correctly on each page and that it is properly configured to track the desired metrics on each domain. Regular monitoring and testing of the tracking code is also important to ensure accurate data tracking.