If you buy a computer from a retailer (like Dell, HP, or Apple), it almost always comes with an operating system pre-installed. For PCs, this is an OEM (Original Equipment Manufacturer) license . You won't see a separate charge for it, but it’s there.
You cannot change your wallpaper, accent colors, or lock screen themes. do i need to buy windows for a new computer
When you pick out individual parts (motherboard, CPU, GPU) and assemble them yourself, the storage drive will be completely blank. You will need to purchase a license key to activate Windows. If you buy a computer from a retailer
A persistent "Activate Windows" watermark will appear in the corner of your screen. GPU) and assemble them yourself