No, but it searches a lot of them.
Take a look at our list of databases not covered by library search for a list of databases you might be missing out on.
Alternately, you can see which databases are included in a search by checking the Database List and looking for the SLib icon 
beside the title of the database.
For example, the icons in the image below tell us that ACM Digital Library is being searched when you search from the library website, but AdForum is not.
This means that you can find ACM Digital Library's content just by searching on the Seneca Library website, but you'll miss out on content from AdForum.
How do I know which database(s) I should use?
If you're looking for databases specific to your subject area, we suggest taking a look at our Subject Guides.