Difference between Mail and E-mail

Parameter	E-Mail	Mail
Description	Electronic mail is a method of exchanging digital messages from an author to one or more recipients. Email operates across the Internet or other computer networks.	The mail or post is a system for physically transporting documents and other small packages, as well as a term for the postcards, letters, and parcels themselves.
Address	It uses Electronic address to send or receive messages.	Physical Address is used to send or receive messages.
Route	No Specific route is followed	Specific Route is Followed
Stamps	Uses Digital Stamps	Physical Stamps are used
Cost	Very Much Cheap	Costlier than Email.
Time	E-Mails are delivered in very short duration from seconds to minutes.	Delivery is slow and may be in days or months.

Difference Between Microprocessor and Micro Controller

Parameter	Microprocessor	Micro controller
Description	It is Multipurpose, Programmable device that accepts digital data as input from external input unit, processes it as per instructions in its memory, and provides results as output at external output unit.	It is a Self Contained System with a processor core, memory, and peripherals and can be used as embedded system.
Software Protection	Software Protection is less achieved in Microprocessor based systems.	Micro controllers offer more software protection by locking the on chip memory and is made protected from external circuit.
Input/output Devices	Keyboard, Mouse, Screen, disks, printers etc.	Switches, Relays, LEDs, LCD Displays, radio Frequency devices ,Sensors
Cost	High, Because Devices like memory, disks, and interfaces are connected externally and has to be purchased separately.	Decreased net cost of the embedded system as a whole, Because no needs to connect external devices like Read/Write Memory, Timers etc., unless you desire to create something beyond the limit.

Difference between Burst Mode and Cycle Stealing Mode of DMA

Parameter	Burst Mode of DMA	Cycle Stealing Mode of DMA
Definition	It is the DMA data transfer technique in which no. of data words are transferred continuously until whole data is not transferred.	It is the data transfer technique in which one data word is transferred and then control is returned to CPU.
Data Transfer	Data transfer Continues until whole data is not transferred.	Data is transferred Only when CPU is idle.
Speed	This is very fast data transfer technique and is used to transfer data for fast speed devices.	It is the slow data transfer technique as data is transferred only when CPU is idle
CPU Utilization	Low CPU Utilization because CPU remains idle until whole data is not transferred.	High CPU utilization because data is transferred when CPU has no task to perform.

Difference between LED and OLED Display

Parameter	LED	OLED
Acronym for	Light Emitting Diode	Organic Light Emitting Diode
Description	It is a flat panel display that uses array of light emitting diodes as video display.	It is also a type of LED in which organic compound is used as emissive electroluminescent layer to emit light when electric current is supplied to it. These OLEDs are self illuminating.
Brightness	LED displays can get extremely bright and have slight advantage.	OLED display can also produce brighter displays but shining OLED pixels to maximum results in reduced pixel life.
Flexibility	Hard Material is used as substrate and can not be used to make flexible displays.	OLED can be fabricated on plastic substrates and can be used for making roll up display and can be embedded in cloths in future.
Black Level	LED displays rely on LED backlights behind an LCD panel and can no produce dark blacks even with advanced dimming techniques that dim LEDs. Hence, LED Displays suffers to produce dark levels.	Dark blacks are the important factor to achieve excellent picture quality allowing higher contrast and richer colors and resulting more realistic images. OLED reigns as the undisputed champion, When it comes to black levels.

Difference Between Wi-Fi and Wi-Max

Parameter	Wi-Fi	Wi-Max
Acronym for	Wireless Fidelity	World Interoperability for Microwave Access
Description	It is a wireless technology that allows any electronic device to exchange and transfer data wirelessly.	It a wireless technology which delivers carrier class, high speed wireless broadband at low cost and covering large distance than Wi-Fi.
IEEE Standard	IEEE 802.11	IEEE 802.16
Implementation	It is basically an implementation of wireless Local Area Connection within a small building, a college, or an institutional building.	It is a wireless broadband metropolitan technology whose objective is to interconnect houses, buildings, or even hot spots to allow communication between them or with other networks.
Cost	Can be implemented by using low cost access pints.	Wi-Max technology requires costly infrastructure.
Frequency band	2.4 GHz to 5 GHz	Licensed/Unlicensed 2 GHz to 11 GHz
Channel Bandwidth	Wi-Fi 802.11b= 25 MHz Wi-Fi 802.11 a/g=20 MHz	Adjustable 1.25 M to 20 MHz
Full/Half Duplex	Half Duplex	Full Duplex

Difference Between Cloud Computing and Grid Computing

Parameter	Grid Computing	Cloud Computing
Definition	It is a collection of heterogeneous Computers from different locations to achieve a common goal.	It is the delivery of computing as a service rather than a product, where resources, software, and information are provided to Computers and Other devices as a utility.
Platform	It makes use of heterogeneous Computers to run.	It makes use of Homogeneous computers to run.
Focused on	Intensive Calculus	Standard and intensive cloud.
Visualization	Not Much Reliable	Reliable
Performance	High	Less than Grid
Research Community	Grid is distributed and has multiple user communities and is grouped in virtual organization.	It has generally one research community and a common group of system administrators that take care of entire domain.

Difference Between Linux and Windows

Parameter	Windows	Linux
Introduction	It is an Operating System developed by Microsoft and  named Windows on November 20, 1985 as a graphical operating system shell for MS-DOS	Linux is a Unix Like Operating System introduced by Linus Torvalds and was first released on 5 October 1991.
License Type	Proprietary Commercial Software and must have to be Purchased before using Windows OS.	Except Red Hat all versions are free and are distributed under GNU GPL License.
File System Supported	NTFS,FAT,FAT 32, ISO 9660, UDF,	Ext,Ext2, Ext3, Ext3, ReiserFS, FAT, ISO 9660, UDF, NFS, NTFS, JFS, XFS, Minux and GmailFS
Versions	Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1 etc.	Red Hat, Suse Linux, Debian, Knoppix, Ubuntu etc.

Difference Between HTML 4 and HTML 5

Parameter	HTML 4.01	HTML 5.0
Doctype Declaration	Three Types of <!DOCTYPE> declarations are used in HTML 4.01 and that are: i) HTML 4.01 Strict ii) HTML 4.01 Transitional iii) HTML 4.01 Frameset	There is Only one type of <!DOCTYPE> declaration in HTML 5 and that is <!DOCTYPE html>only.
Plugin Requirement	External Plugins are required to play audio and video files on HTML 4.01.	HTML 5 does not require any external plugin to play audio and video files.
Attributes	Accept, Accept-charset, Action, Enctype, Method, Name, Target.	Accept-charset, Action, Enctype, Method, Name, Target, Autocomplete, Novalidate.
Input Types	Button, Checkbox, File, Hidden, Image, Password, Radio, Reset, Submit, Text.	Button, Checkbox, File, Hidden, Image, Password, Radio, Reset, Submit, Text, Color, Date, Datetime, Datetime-local, email, Month, Number, Range, Search, Tel, Time, Url, Week
Automatic Validation	Not Supported in HTML 4.01 and is achieved by other Scripting Languages.	Automatic Filed Validation is Supported in HTML 5.0

Difference Between DBMS and RDBMS

Parameter	DBMS	RDBMS
Acronym for	Data Base Management System	Relational Data Base Management System
Relation	Data is stored in flat file oriented System and no relations are used.	It provides facility to create relation between tables.
Dr. E.F. Codd Rules	Only 3 rules, Out of 12, are followed by DBMS. (from Rule 0 to Rule 12)	Minimum 6 rules, Out of 12, are followed by RDBS. (from Rule 0 to Rule 12)
Data Security	It can’t implement constraints in Tables and has less Security. The ACID (Atomicity, Consistency, Isolation and Durability) property of the database is ensured by Programmer.	It can implement the integrity constraint for the purpose of holding ACID (Atomicity, Consistency, Isolation and Durability) property of the database and is much securing than DBMS.
Generation	3GL	4GL