If using a Microsoft operating system such as DOS or Windows, a couple of text editors are readily available with the system. In DOS, there is the old Edit text editing program, which may be invoked by typing edit at the command prompt. InWindows (3.x/95/98/NT/Me/2k/XP), the Notepad text editor is your stock choice. Many other text editing programs are available, and some are even free. I happen to use a free text editor called Vim, and run it under both
Windows 95 and Linux operating systems.
That means that is the option the comes built into Windows. Like what comes 'stock' on a new car from the factory. In this case, what comes with the operating system and is available even if you haven't 'upgraded' by installing something fancier.
As a sidenote, notepad has its uses but if you use a text editor much you probably should upgrade--but what you should upgrade to depends on why you are using a text editor.