Windows 95 sold over a million copies in four days and made the GUIGraphical user interface — windows, icons, and pointers instead of typed commands. PCPersonal computer — a computer designed for individual use, especially desktop or laptop machines. mainstream. Its $300 million launch campaign and bundled MS-DOSMicrosoft Disk Operating System — the OS bundled with early IBM PCs and PC compatibles. kernelThe core of an operating system that manages hardware, memory, and processes — everything else depends on it. defined the PCPersonal computer — a computer designed for individual use, especially desktop or laptop machines. software stack for a decade — the platform most developers targeted until the web and mobile shifted the center of gravity.

Windows 95 unified DOSDisk Operating System — an OS centered on disk storage; often refers to MS-DOS on PCs. and Windows and set the desktop UIUser interface — the parts of software people see and interact with. patterns billions still recognize.

Preemptive multitasking and Plug and Play made PCs approachable for home and office users at scale.