A 'journal' or 'periodical' or 'serial' = any publication published regularly (includes magazines, newspapers, newsletters).
A ‘scholarly’ or 'academic’ journal: periodical containing research articles, that is peer-reviewed, and aimed at researchers.
Peer review: every paper/article submitted to the journal is reviewed by independent experts. Papers are accepted/rejected based on quality.
The JSTOR Understanding series is a research tool from JSTOR Labs that connects primary texts with journal articles and book chapters on JSTOR that cite those texts. It includes ten key works of British literature, the King James Bible, and all Shakespeare plays and sonnets. Further information here.