Search engines and digital libraries both provide search capabilities but work differently: - Search engines use crawlers to index the web and return keyword search results, while digital libraries provide access to structured collections of digitized materials from libraries and archives. - Both have limitations in coverage, and searching must be done individually in different databases within digital libraries rather than via federated search. - It is important for users to understand how each system works, what is included in their indexes, and how results may be influenced by business models, sponsorship, or other factors to get the most relevant information for their needs.