Cache Memory

Cache Memory is small and fast memory which is placed between the CPU and main memory.It store data temporary for faster accessible means when you are working on any type of docs. or other document the temporary work get stored in the cache memory that it doesn't have need to access data from primary memory .You asked then what is the need of Primary if temporary data may be accessed by Cache memory.The Cache memory size is not much more than the primary memory that it hold all buffer data..so there is need of primary data.See below example then you figure out what the differences:-

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Flash Memory

Flash memory is High-density device which called as Non-volatile Memory.It's Fast in reading and writing data.This memory writes data in chunks and blocks.It's electrically re-programmable device and also this memory is erased in blocks and not in bytes.The block size can  range from 256 bytes  to 16 Kilobytes. It replace hard disk  in portable computer.
We find it in :-

•  Pen-drive
•  MMC (Multimedia Card)
• SD(Secure Digital)
• Compact flash
• Memory Stick
• xD-picture Card
• Smart Media
• USB
  

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Physcial Memory

Physical memory is mainly considered to the RAM(Random Access Memory) used in Computer.RAM work as primary memory in a computer and helps PCs to run and access faster .It is also considered as temporary memory which can store data during the electric power supply and data vanished or you say erased when light turn off.These days physical memory come in market at different speed and different size .
The types of Physical memory:-

• DRAM(Dynamic Random Access Memory)
• EDODRAM (Extended Data Out Dynamic Random Access Memory)
• SDRAM (Synchronous Dynamic Random Access Memory)
• DDRRAM (Double Data Rate Synchronous Dynamic Access Memory)
• RDRAM (Rambus Dynamic Random Access Memory)
• SGRAM (Synchronous Graphics Random Access Memory)
• FPMDRAM (Fast Page Mode Dynamic Random Access Memory)
• VRAM (Video Random Access Memory)
  

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Non-Volatile memory

Non-Volatile memory is a type of computer memory which holds data for long time and even the power off situation create it holds data for last long.The most better example for the Non-volatile memory is ROM(Read-only Memory), Flash Memory, F-RAM(ferro electric RAM). Mostly this type of memory is known as Secondary storage memory but it is just programmed and installed in PCs and laptop .

 

Types of Non-Volatile Memory:-

•  Mask ROM
• Programmable Read only Memory(PROM)
• Erasable Programmable Read Only Memory(EPROM)
• Electrically Erasable programmable Read Only Memory(EEPROM)
  

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Volatile Memory

Volatile memory is a computer memory that requires power  to maintain the storage information.It's data removed or clean while power is off but still the information is stored when you are working on it.In this memory the data losses is rapid and immediately.
Volatile memory is faster than the Hard disk drive .
The best example of volatile memory is RAM.

There are two types of RAM:-

• Static Random Access Memory(SRAM)
• Dynamic random Access Memory(DRAM)
  

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What is Server?

Introduction:
Server  means service provider (In simple language). It is a computer program or a device that provides functionality for other program or devices called client.Generally,People know this type of architecture as Client -Server architecture or model.

History:
The word Server comes from Quening theory.In short, I try to discuss it..
Quening  theory is the mathematical study of waiting lines, or ques.In queuing theory a model is constructed that queue length and waiting time can be predicted.
This idea since seen in telecommunication,traffic engineering.

Purpose:
The main work of server is to share data and resource to their client.The server computer works on Quid pro quo method (Means exchange of goods or services)

Types of Server:

1.Application Server:

Host working on web apps allowing users in the network to run and use them without having to install a copy on their own computers.

2.Catalog Server:

Its work as maintain index or table of contents of information that can be found across a large distributed network .Directory Services and Name Server are examples of catalog server.

3.Communications Servers: 
 This server maintain an environment needed for one communication endpoint to find other endpoints.Here endpoints denote to the users or devices which are connected to the server.

4.Computing Server:
This server only shares vast amount of computing resources,like CPU(central processing Unit),RAM(Random Access Memory) over the network.


5.Database Server:
Database server maintains and shares any form of database.In this server data with predefined properties that may displayed in a table.

6.Fax Server:
This server work only to share fax machines over network.

7.File Server:
This server work to share file and folder and share storage space to holds files and folders,or both. 

8.Game Server:
This server enables several computers or gaming devices to connect to play multiple games.

9.Mail Server:
This server only work to mail communication as the same way that post office make snail mail communication possible.

10.Media Server:
Media server only shares digital video and audio over a network through media streaming.

11.Print Server:
Print server shares one of more printer over a network.

12.Sound Server:
Sound server enable computer programs of a computer to play sound and record sound.


13.Proxy Server:
Proxy server acts as an intermediary between a client and a server.

14.Web Server:
A web service has been implemented which helps user to browse web service.

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