Comment by Maxatar

This article is specifically about QBASIC, which was bundled with MS-DOS, and by extension Windows up until Windows Me. QuickBASIC is a separate stand-alone application that predates QBASIC. The two certainly shared a lot of similarities, but they were not part of the same product line.

Microsoft developed numerous variations of BASIC from Altair BASIC, MBASIC, GWBASIC, PDS BASIC, and of course the most well known of them all, Visual Basic.

QBASIC was the only of these that was "free" in the sense that it came bundled as part of the operating system, and never sold as a stand-alone product.