Explanation
You can use an eDiscovery case to create and manage eDiscovery holds that can be applied to user mailboxes and other content locations in Microsoft Purview . You can also use an eDiscovery case to search for and export content from mailboxes and other locations An eDiscovery case is different from a Litigation Hold, which is a hold that is applied to user mailboxes in Exchange Online1. A Litigation Hold isn't identified by a GUID A sensitive info type is a predefined or custom entity that can be used to identify and protect sensitive data in Microsoft Purview2. It is not related to placing a hold on email messages.
A data loss prevention (DLP) policy is a policy that helps prevent the accidental or intentional sharing of sensitive information outside your organization . It is not related to placing a hold on email messages.
An information barrier segment is a group of users who are allowed or blocked from communicating with each other in Microsoft Teams or SharePoint Online . It is not related to placing a hold on email messages.