Library Databases are subscription collections (i.e. things that we pay money to access) of research sources including: Periodical (Magazine, Newspaper, Trade Journal, Scholarly Journal) articles, electronic Reference Books, Images, Videos, Primary Documents and more.
So why do we pay for them when Google and the Web exist?
Gale? Ebsco? ProQuest? Huh?
Databases are like streaming video services: Netflix, Hulu, Disney Plus, etc. all are services that let you stream and watch movies and TV shows. They don't all have the same content though, and some have exclusive programming. Databases are the same way: they cover different books and magazines.
Gale, Ebsco, and ProQuest are three different database companies. We have multiple databases from each.