Developer of JavaScripts are Netscape Communications Corporation, Mozilla Foundation. As name indicate you think it is essential related to Java. Its wrong its syntax matched with C Syntax,it use some java name and their convension. It is influenced by Seff,C,Scheme,Perl,Python,Java. Using this we can do many thimgs like: to improve Design,validate forms,detect browsers etc. JavaScript can be use by new programmer easily. I have given you some most important point related to JavaScript. 

1. JavaScript is a trademark of Sun Microsystem. 
2. It is dynamic,Weak and prototype language. 
3. Using JavaScript we can make our HTML pages interactive. 
4. JavaScript is a scripting language.
5. We can embedded JavaScript directly into HTML pages.
6. It is an interpreted language means for execution their is no need to pre-compilation of JavaScript. Latest version of JavaScript is 1.8/ 2008

 No, they are not.

Java (developed by Sun Microsystems) is a powerful and much more complex programming language in the same category as C and C++.

JavaScriptwas created by Brendan Eich at Netscape and was first introduced in December 1995 under the name of LiveScript. However, it was rather quickly renamed JavaScript, although JavaScripts official name is ECMAScript, which is developed and maintained by theECMA (European Computer Manufacturer\'s Association) International organization.

1. JavaScripts are simple pre compiled code.We use this code into the HTML pages to make interactive .It is easy to use. 
2. Using JavaScript we can set dynamic text into the HTML page.Example:document.write(\"+text+\") 
3. we can also set JavaSCript perform when some event happen means its automatically call when some special event execute.
4. Using JavaScript we can read HTML element and changed the content of element. 
5. Using JavaScript we can validate the data before sending to to the server.Means that we can reduce the server Urocessing before using JavaScript. 
6. Using JavaScript we can identify the user\'s browser. 
7. Using JavaScript we can also create the cookie and used this cookies to store and retrieve info on user\'s system.

1. ECMAScript is an official name of JavaScript.
2. ECMA Organization developed and maintain ECMAScript.
3. An official JavaScript standard is ECMA-262.Development to of this started in 1996 and It is first used in ECMA     General Assembly in june 1996.
4. It gets cettificated by international ISO (ISO/IEC 16262) standard in 1998.
5. It is usually based on JavaScript and Jscript Repectively given by Netscape and Microsoft.First it is invented by   Brendan Eich at Netscape and applied on Navigator 2.0 after 1996 it is used on all type of Netscape and     micrisoft   browser.

Example:

Example:

     $var=10;

     $VAR=10;

Both variable show diffrent value.

we can define JavaScript as a sequence of JavaScript Statements.Statement write in JavaScript Code executed one by one in order they have written.
Example:

1. <script type=\"text/javascript\">
2. document.write(\"<h1>Here you write header</h1>\");
3. document.write(\"<p>Here write your first paragraph</p>\");
4. document.write(\"<p>Here write your second paragraph</p>\");
5. </script>
6. 
   

 Generally, We use Comments in JavaScript to make JavaScipts easily understand.We start to write single line comment by //.Example:<script type=\"text/javascript\">// Here write the header:document.write(\"<h1>This is my header</h1>\");// Below I have write two paragraphs:document.write(\"<p>This is my first paragraph</p>\");document.write(\"<p>This is my second paragraph </p>\");</script> We can write multiline comment on JavaScript also.We start to write multi line comment with /* and ends with */.Example:<script type=\"text/javascript\">/*Here I have write one header and two paragraphs*/document.write(\"<h1>This is my header</h1>\");document.write(\"<p>This is my first paragraph </p>\");document.write(\"<p>This is my second paragraph </p>\");</script>
 We can stop execution of some code by using comments like that,
//document.write("<p>This is my first paragraph.</p>");
 We can also write comments on the end of the line.
document.write("Hello");//This statement will write Hello.
document.write("World");//This statement will write World.

Variables may be of single character or group of characters. I have given you rules using them you can use variables in JavaScript.

 1.In JavaScript variables are case-sensitive means xand X both are different variables in case of JavaScript.  2.Keep in mind JavaScript should begin with a letter or underscore\'_\'.

 Example:var v;var variablename; Here,I have only declare(created) variables not assigning any values to them.  var v=7;var variablename=\"xyz\"; Here, I have assign the values to both variables are 7 and xyz respectively. 

We assign number without quotes and if want to assign text to variables than write text with in quotes.

 InJavaScript When you assign the values to the variables without declaring them.javaScript automatically declare the variable.Example: Here,we assign the value to v and variablename with declaring them.v=7;variablename=\"xyz\"; Than it will work as same as,var v=7;var variablename=\"xyz\"; 

 JavaScript give us facility to Redeclare JavaScript Variable without loosing data that variables have already contain. we can also perform arithmetic operations with JavaScript variables. a=9;b=a-7;

Using Airthmetic Operators we can perform some airthmetic operation like this.

 if y=5

 Addition x=y+4 x=9-

 Subtraction x=y-4 x=1 

 Multiplication x=y*2 x=10

 Division x=y/2 x=2.5 

 Modulus x=y%2 x=1 

 Increment x=++y x=6 

 Decrement x=--y x=4 

.I have given some comparison operators with their describtion.== is equal to

 === is exactly equal to

 != is not equal to 

> is greater than 

is less than

 >= is greater than or equal to

 <= is less than or equal to

 Example: 

if (gender==M) document.write(\"he is a male\");

 Logical Operator: We use logical operators to find out the logic between variables or values.Let, x=6 and y=3, logical operators: && and (x < 10 && y > 1) is true

 || or (x==5 || y==5) is false 

! not !(x==y) is true

 Conditional Operator: Using conditional operater we can assign the resultant value to the variable.Syntax:variablename=(condition)?val1:val2

 Example:welcome=(user==\"Professional\")?\"Dear Professional \":\"Dear \"; If the user is equal to professional then Dear Professional is assign to the welcome otherwise Dear assign to the welcome.