Final answer:
If you install the same default tracking code on pages with different domains, analytics data gets compromised due to inaccurate visit counts and user session tracking, necessitating the use of cross-domain tracking for accurate data.
Step-by-step explanation:
If you install the same default tracking code on pages with different domains, you will encounter several issues related to analytics data accuracy. By default, most web analytics systems are designed to track user interactions on a single domain or on multiple pages of the same domain.
When the same tracking code is installed across different domains, the analytics platform can't differentiate if a user navigating from Page A of one domain to Page B of another domain is the same person or a new visitor. This can cause the analytics service to count the user as a new visitor on the second domain, inflating visit counts and distorting other metrics like user sessions and bounce rates. To track user behavior accurately across multiple domains, you would need to implement cross-domain tracking.
Without proper cross-domain tracking, the analytics data will be fragmented and won’t reflect user pathways or referral information correctly, making it challenging to obtain a holistic view of the user journey and reducing the effectiveness of your data analysis and decision-making.