Tags are a quick and easy method of classifying content within a website. They can be thought of as keywords or labels (metadata) that allow content to be more quickly found as the result of a search.
In Adobe Experience Manager (AEM), a tag can be a property of
1, a content node for a page (see Using Tags )
2. a metadata node for an asset (see Managing Metadata for Digital Assets )
In addition to pages and assets, tags are used for AEM Communities features
1. user generated content (see Tagging UGC)
2. Enablement Resources (see Tagging Enablement Resources )