Scholarly (aka academic) articles are written by and for academics, researchers, and experts in the specific topic or broader subject area of the article.
Peer reviewed (aka refereed) articles are those which have been reviewed prior to publication by other experts in the topic of the article. Often reviewers are external (not members of the journal's editorial staff or board).
PsycINFO records indicate whether the article is from a peer reviewed journal; see Publication Type field near bottom of record.
Reports original research or experimentation
Critically surveys and analyzes the current state of published research on a particular topic; doesn't include original research
Describes one or more theories, frameworks, models, etc. and tends not to include empirical data
Comments on or offers a perspective or opinion on a topic; doesn't require original research
Note: Not everything in a journal is peer reviewed; letters to the editor, book reviews, news items, and other short works without listed references are typically not peer reviewed the way more substantive articles are.