A marketer may later search for 'people collaborating around a table', 'minimal product photo with blue background', 'busy outdoor event', or 'quiet premium interior'. Those concepts may never have appeared in the filename, caption, or folder name.
Semantic search represents the content of the asset in a way that can be compared with the meaning of the query. It improves candidate retrieval, but it does not remove the need for human checks around accuracy, rights, identity, freshness, and brand suitability.