Hey @lambanitish Hope you are doing well. These resources could answer
your question:
https://experienceleaguecommunities.adobe.com/t5/adobe-target-questions/how-do-we-tell-target-a-user-s-session-is-over-and-a-new-one-is/td-p/307623
https://experienceleague.adobe.com/docs/target/using/activities/troubleshoot-activities/content-trouble.html?lang=en
https://developer.adobe.com/target/before-implement/privacy/cookie-behavior/?lang=en