The most notable new features were USB 2.0 support, offering bootable USB Drives for Installing Microsoft Windows XP from usb devices (usb-stick, usb-hdd, SD card).
Windows XP is a line of operating systems produced by Microsoft for use on personal computers, including home and business desktops, laptops, and media centers. The name "XP" is short for "experience". Windows XP is the successor to both Windows 2000 Professional and Windows Me, and is the first consumer-oriented operating system produced by Microsoft to be built on the Windows NT kernel and architecture.