The scope of a variable is the life time of a variable of source code in which it is defined.
A global variable has global scope; it can be defined everywhere in the JavaScript code.
Variables declared within a function are defined only within the body of the function. They are local variables and have local scope.

Sellinam and Ponmadal are familiar Tamil keyboard layouts that works on Android operating system in Smart phone using phonetics.

User-defined functions allow the programmer to modularize a program. Most computer programs that solve real-world problems are much large, occupy more space in the computer memory and takes more time to execute. Hence such large programs are divided into small programs called modules.

A function is a block ofJavaScript code that is defined once but may be executed or invoked any number of times.

General format of <Link> tag
<Link rel = "Stylesheet" type = "text/css" href = CSS_ File_Name_with_Extension>

(i) < strong > Important text :The < strong >   tag is a phrase tag. It is used to define important text. This tag displays the text as bold.
(ii) < em >   Exphasized text : The < em >   tag is used to emphasize the text. That means, when this tag used the text will be in italics.

The tag <!> is used to create comments. In HTML, the text what you type within this tag is considered as comments and it is ignored by the browser. Comments never show up onscreen. Comments can be placed anywhere in HTML document.
The general form of comments: <! comments >

(i) Websites that display marks of Public Examinations and Entrance Examinations changes when different register numbers are given. Such websites are called as Dynamic websites.
(ii) Example: Websites of Government and Entrance Exams.

Protocol, domain, path, hash and query string.

A search engine is a software system that is designed to search for information on the World Wide Web.
Example: Yahoo, Lycos, Hotbot and Google.

(i) Local Area Network (LAN)
(ii) Metropolitan Area Network (MAN)
(iii) Wide Area Network (WAN)·
(iv) Campus Area. Network (CAN)
(v) Wireless Local Area Network (W-LAN)

The server distributions in Linux OS
(i) Ubuntu
(ii) CentOS
(iii) Red Hat
(iv) SUSE
(v) Fedora

Open Source refers to a program or software in which the source code is available in the web to the general public free of cost.

Files	Folders
File is the collection of records.	Folder is a collections of files.
Create a file : Start \(\rightarrow\)All Programs \(\rightarrow\) select application \(\rightarrow\) ok	Create a folders: Right click \(\rightarrow\)New \(\rightarrow\) folder \(\rightarrow\)ok

Cut	Copy
It is the process of moving a block from  one place to another	It is the process of making duplicate copies of the block of a worksheet.

Ubuntu, Mint, Fedora, RedHat, Debian, Google's Android. Chrome OS, Chromium OS.

Multi-user Operating Systems:
1. It is used in computers and laptops that allow same data and applications to be accessed by multiple users at the same time.
2. The users can also communicate with each other. Windows, Linux and UNIX are examples for multi-user Operating System.

A Microprocessor's performance depends on the following characteristics:
(a) Clock speed
(b) Instruction set
(c) Word size

The primary memory is used to temporarily store the programs and data when the instructions are ready to execute. The secondary memory is used to store the data permanently

(i) The ALU performs arithmetic operations.
(ii) The result of an operation is stored in internal memory of CPU.
(iii) The logical operations of ALU promote the decision making ability of a computer.

Data	Information
Data is defined as an unprocessed collection of raw facts, suitable for communication, interpretation or processing.	Information is a collection of facts from which conclusions may be drawn.
(Eg) 134, 16, 'Kavitha', 'C'	(Eg) Kavitha is 16 years old.

Templates are built-in design files which contain different predefined styles, such as fond face and size, bullet size, place holder's size and position, background, colors heme and slide master.

General Syntax of constructing a formula is:
= cell reference1  <operator> cell reference2   <operator> ...................... .

Cell pointer is a rectangle element which can be moved around the worksheet.

To merge a group of cells:
(i) Select the cells to merge.
(ii) Right click and choose Cell ➝ Merge or choose Table ➝ Merge Cells from the menu bar.