The physical components of a computer. Computer items that you can see and touch. Disks, keyboards, monitors, chips, computers, wires, and etc., are all hardware items.
HDTV (High Definition Television)
HDTV uses digital signals for video output. A standard television uses analog signals. HDTV has much better resolution than regular television. Computer monitors operate with digital signals, but not all monitors are HDTV. HDTV screens are normally thin and flat.
HTML (Hypertext Markup Language)
The standard language used for creating WebPages or other HTML files.
HTTP (Hypertext Transfer Protocol)
The standard used to transfer WebPages on the Internet.
A famous car rental company. :-) Actually, when referring to technology, a hertz is one frequency cycle per second.