However, you need to know how frequently each database is updated. Be aware that most databases have some lag time, i.e. it takes some time for very recent materials to be included in the database. Most databases are indexes . It does not give you the text of books. They don't give you the articles.
Search engines provide links to web pages.
They don't provide the pages. Some databases provide data or the full text of articles. In addition to indexing, some databases provide statistics or data. However, most often databases that provide content, provide text. That is, some databases provide the full text of articles that are indexed in that database.