There are databases and collections of journals in the MKL catalog Summon that are open access (known also as OA). You may have come across an open access article while conducting library research or searching the internet and not have known it.
Here's a definition of what Open Access is from UNESCO:
"Open access (OA) means free access to information and unrestricted use of electronic resources for everyone. Any kind of digital content can be OA, from texts and data to software, audio, video, and multi-media. While most of these are related to text only, a growing number are integrating text with images, data, and executable code. OA can also apply to non-scholarly content, like music, movies, and novels."
Because they are free, OA journals are published differently than traditional subscription journals. Read more about that on the Scholarly Communication Guide.
Below is a list of the major collections freely accessible to everyone.