Impersonation allows users or user groups to act on behalf of other users or user groups with in terms of permissions on content, the product catalog, and products.
Impersonation supports the type-ahead search feature. The impersonation search bar will provide suggestions when a user enters some text in it, based on the query that it is given. See Figure 1.2 for demonstration.
For more information about the setup for impersonation, see this article.