What is a Computer?

Computer stands for "Commonly Operated Machine Particularly Used For Trade Education and Research". It is a very versatile electronic machine man has ever created. Computers have made a great impact on everyday life. Their presence is felt in almost everyway of life be IT home, School, College, Office, Industry, Hospital, Bank, Retail stores, Railways, Research and Design Organizations etc.

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Memory Unit and types of memory

Memory Unit Found on the motherboard Short Term Random Access Memory (RAM) Long Term Read Only Memory (ROM) Random Access Memory (RAM) RAM is a read/write memory. Information can be written into and read from a RAM. It is a volatile memory. It retains the stored information as long as it is supplied with power supply is switched off or interrupted, the stored information in the RAM is lost. RAMs of various capacities are available for example, 256MB, 512MB and so on. Read Only Memory (ROM) Rom is a permanent type memory. Its content are not lost when power supply is switched off. The user cannot write into a ROM. Its contents are written into at manufacturing time. ROMs store permanent programs and other types of data which are needed by the computer to execute user program. Types Of ROM PROM (Programmable ROM) EPROM (Erasable PROM) EEPROM (Electronically Erasable PROM) Cache Memory The data or contents of the main memory that are used frequently by CPU are stored in the cache mem...

What do Computer do? Data and Information

What do Computer do? Input, Process, Output and Store data Data and Information All Computer processing requires data, which is a collection of raw facts, figures and symbols, such as numbers, words, images, video and sound given to the computer during the input phase. Computers manipulate data to create information. Information is data that is organized, meaningful and useful.

Memory

Optical Discs Use laser technology to read and write data on silver platters. Compact Disk (CD) can store 650MB to 800MB of information and data. CD-ROM (Read Only Memory) can only read data from a CD-ROM. You can store data on a CD only if you have a CD Burner and CD-R (writable) or CD-RW (rewritable) CD. Digital Versatile Disk (DVD) Digital Versatile Disk (DVD) is the size of a regular CD and can be played in a regular DVD movie player. DVD can store 4.8GB to 8.0GB of information and data. DVD-ROM is readable only (a movie DVD). You can store data on a DVD only if you have a DVD Burner and DVD+R/DVD-R (Writable) or DVD-RW (rewritable) DVD. Pen Drive USB (Universal Serial Bus) Pen Drive is a compact secondary storage device. It is also known as a USB flash drive, thumb drive or a jump drive. It connects to a computer via a USB port. It is commonly used to store and transferrer data between computers. SD Card SD Card stands for Secure Digital Card. It is most often used in p...

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