1.Is there a difference between data and information?
Yes
1.Data becomes information when its presented in a format that people can understand and use.
2.Data is used by machines,such as computer,Information is used by humans.

2.How does RAM differ from hard-disk storage?
1.Data hold in circutry that's connected directly to the system borad.Wheras hard -disc storage please data on the magnetic media.
2.RAM is temporary storage.hard -disc storage is more permanent.
3.RAM has less storage capacity than hard-disc storage.

3.Why are hard-disk device so popular?
1.It provides lots of storage capacity.
2.It provides a fast access to the files.
3.It is economical.

To turn on a desktop computer,you need to press the power button for the system unit and the power button for the monitor.

System unit is not a peripheral devices.Monitor,Printer,scanner are peripheral devices.

It is improtant to turn on all peripheral devices before you turn on the system unit.

During the Windows "boot process " the computer checks it circuity,loads the operating system,looks for connections to peripheral devices.

When a computer is in "sleep" mode it conserves power by not running the monitor or disk drive.

A screen saver will be displayed on a computer monitor after a specified period of inactivity on your computer.

Screen saver were originally designed to prevent an image from being permanently "burned" onto the screen.

To clear a screen saver,you would move the mouse or press any key.

You can select a different screen saver in the desktop dialog box.