Academic journals are great sources of the latest academic research. They are published a bit like magazines at different intervals. Some may be monthly, others may be quarterly. You will be expected to use read and use academic journals for your studies. Your lecturer may recommend some journal articles on your Library Reading List but you will be expected to search for your own journal articles too.
Some academic journals are available open access – this means that they may be freely available to read online. Most journals however, require a subscription. The library subscribes to many journals to support your studies.