Illustrator was, I believe, Adobe's first consumer-level product (in those early years they made their money licensing PostScript printers). Illustrator began as, and has remained, principally a single-page application. They acquired Aldus in the early nineties, and permitted its flagship product, PageMaker, gradually to die of neglect, although I used it up until the turn of the century, whereupon I jumped ship to InDesign, a product with which I have been largely pleased.
cordially,