This video demonstrates how to use Amazon Textract's Custom Queries feature to enhance document analysis accuracy. It walks through the process of creating and training adapters in the Textract console, including uploading documents, adding queries, and annotating documents. The tutorial covers creating datasets, auto-labeling, reviewing annotations, and training the adapter. It also shows how to evaluate adapter performance and use the trained adapter for document analysis. Custom Queries allows users to customize pre-trained queries for improved results on specific document types.