Good? You need to be more specific - computer (API) changes what you see on the screen to - readable computer language, machine or binary. Which has two choices on or off or 0 or 1 or positive vs negative (or plain English is the light off or on). Her is a better question: A digital signal composed of a pulse of positive voltage represents an 1 or a positive.
The changes talking place in our surroundings and which are useful to us are called Useful changes. The changes which are not useful but harmful are called Harmful changes
Trojan Horses
It is a virus called Mal-ware (Malicious Software) and is programmed to destroy critical files on a computer, these viruses to be undetected will travel in a Trojan Horse that will transport viruses in and out of the computer system.
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changes both harmful and useful
The components of computer which can be touched are called hardware component without hardware components computer are not useful.
To optimize means to make something as efficient or useful as possible. For example, having a computer optimized means making it run as quickly as possible.
Computers communicate with the outside world via specialized hardware. The hardware numbers are engineered to be unique (manufacurer etc.) To bridge the hardware (which changes ) to something symbolic there is a system of numbers. The default number for every computer is 127.0.0.1 and refers to the localhost the machine you are working on.
Computer software is made of the instructions that tell the computer hardware how to do something useful that people need done. Computer hardware is the physical objects (e.g. electronic, optical, mechanical) that make up the machinery and mechanism of the computer.
It was a useful object to use. It was not useful to the team to have to struggle with the new machine.
"A back up drive is very useful to have. If your computer crashes, a back up drive can hold all of your important information that you saved on your computer. Back up drives can store important files such as pictures and other documents."
A thermometer and light meter are the most useful when measuring two environmental changes.