JSTOR is a not-for-profit archive of journal articles.  Their emphasis is to collect articles from core scholarly journals, and every article on JSTOR is full-text.  JSTOR archives the entire run of a journal, starting with the first issue, but there are generally no current holdings.  There is usually a 2-5 year delay between a journal’s current issue and the journal’s content available at JSTOR.  The earliest articles available from JSTOR are from 1665. 

JSTOR only displays scanned images of the bound original articles in an effort to maintain the integrity, accuracy, original appearance, and non-text elements of the journal articles.  All articles from JSTOR have a stable URL (persistent link).  In order to link to the article, simply copy and paste the URL.  

JSTOR is principally a social sciences and humanities database, but there are also hundreds of thousands of article holdings from a wide variety of journals dedicated to art, business, law, mathematics & statistics, the biological sciences, and other disciplines.