A 'periodical' or 'serial' = any publication published regularly (includes magazines, newspapers, newsletters).
A ‘scholarly’/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.
Academic Search Complete is a scholarly, multi-disciplinary full-text database. The database features PDF content dating back as far as 1887, with the majority of full text titles in searchable PDF format.
JSTOR provides a comprehensive digital archive of important scholarly journals. It offers multidisciplinary and discipline-specific collections that include complete runs of journals as well as select monographs, transactions, and conference proceedings.