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Function Keys
              Keys labelled from F1 to F12 are function keys. These are sets of keys on a computer keyboard that perform specific
              functions within software applications and the operating system. Their functions differ from program to program. For
              example F1 key in most programs is to get help on that program.
              Some important functions performed by some of the keys are:
              •  Control keys: These keys such as Control (CTRL), SHIFT, SPACEBAR, ALT, CAPS LOCK and TAB are used in combination
                with other keys to perform specific functions related to the operating system or software applications.
              •  Enter key: The Enter key, also known as the Return key, is a fundamental key on a computer keyboard. Its primary
                purpose is to execute a command or to move the cursor to the next line in a text document.
              •  Punctuation keys: Punctuation keys include keys for punctuation marks, such as colon (:), semicolon (;), question
                mark (?), single quotation marks (' '), and double quotation marks ("") are essential for proper grammar, syntax, and
                communication in written language.
              •  Navigation keys: These keys allow you to move the cursor or navigate through text and documents. They are
                essential for editing, selecting, and moving within different software applications. Arrow Keys (Up, Down, Left,
                Right) allow you to move the cursor or highlight text in the corresponding direction. The Home key moves the cursor
                to the beginning of a line of text or to the start of a document. The End key moves the cursor to the end of a line of
                text or to the end of a document. The Page Up key scrolls up one page at a time in a document or on a web page.
                The Page Down key scrolls down one page at a time in a document or on a web page.
              •  Command keys: Command Keys, such as INSERT (INS), DELETE (DEL), and BACKSPACE execute specific commands or
                functions within an application or the operating system. When the INSERT key is turned ON, it helps you overwrite
                characters to the right of the cursor. The DELETE key and the BACKSPACE key are used to remove typed text,
                characters and other objects on the right and left side of the cursor, respectively.
              •  Windows key: It is often denoted by the Windows logo (  ), and is found on most Windows-compatible keyboards.
                Pressing this key opens the Start menu.


                      INTERNET—INTRODUCTION

              Nowadays, the Internet has become an important means of communication for the people even at remote locations. It
              is a worldwide system of interconnecting computers through a global network for the purpose of sharing information.
              It can be accessed by anybody all over the world.
              It is defined as: "A global system of networks using wired or wireless mediums to interconnect different types of
              networks consisting of billions of computers, smartphones and other smart devices for sharing data and information
              with add-on features of entertainment, services and e-commerce."
              If your computer is connected to the Internet, you say that your computer is online. With the help of the Internet, you
              can gather a lot of knowledge which is available on it. The knowledge is stored in a big library/storehouse, called the
              World Wide Web (WWW) or the Web. It is a collection of different websites that you can view if you are connected to
              the Internet. You can also use these websites to buy something, watch movies, read books, learn new skills, educate
              yourself, find the best colleges to study further, etc.
              Uses of the Internet

              There is no limit to what you can do online, but some of the most common uses are given below:
              •  Search information: The Internet helps to locate information  from the world  wide web using  search engines.
                These are websites that allow users to search for any information using keywords or phrases. You can get the latest
                information about anything that is uploaded on the web, whether it is the result, news about an earthquake, a
                cricket match or the election details.
              •  Shopping: You can buy and sell products, such as books and electronic goods over the Internet. You can also pay for
                these products via digital modes of payment, such as wallets, plastic cards or e-banking.

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