A computer has two types of memory.
1. Non-volatile and
2. Volatile.
Volatile memory is computer memory that requires power to maintain the stored information.
* It is a temporary memeory which cannot contain information permanently.
Example :: RAM or Random Access Memory
Non-volatile memory is computer memory that can retain the stored information even when not powered.
* It is a permanent memory in which data is stored in permanently.
Examples :: Hard disc, ROM, Floppy discs, Magnetic tape,...
Dots per inch (DPI, or dpi) is a measure of spatial printing or video or image scanner dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch (2.54 cm).
A search engine is a set of programs which enables users to search documents and files ihe world wide web.
Common search engines are Google, Yahoo, Bing,...
The operating system manages all the CPU, disc drives, establish a user interface, execute and provide services for applications software, printers, etc...
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