Keyboard and Mouse

A computer keyboard is an input device that allows a person to enter letters, numbers, and other symbols (these are called characters in a keyboard) into a computer. It is one of the most used input devices for computers. Using a keyboard to enter lots of data is called typing.

The keys on your keyboard can be divided into several groups based on function:

• Typing (alphanumeric) keys. These keys include the same letter, number, punctuation, and symbol keys found on a traditional typewriter.
• Control keys. These keys are used alone or in combination with other keys to perform certain actions. The most frequently used control keys are Ctrl, Alt, the Windows logo key 
  
  , and Esc.
• Function keys. The function keys are used to perform specific tasks. They are labeled as F1, F2, F3, and so on, up to F12. The functionality of these keys differs from program to program.
• Navigation keys. These keys are used for moving around in documents or webpages and editing text. They include the arrow keys, Home, End, Page Up, Page Down, Delete, and Insert.
• Numeric keypad. The numeric keypad is handy for entering numbers quickly. The keys are grouped together in a block like a conventional calculator or adding machine.

A computer mouse is a handheld hardware input device that controls a cursor in a GUI (graphical user interface) and can move and select text, icons, files, and folders on your computer.

 uses of a mouse?

Below is a list of computer mouse functions to give you an idea of all the things a mouse is capable of doing.

1. Move the mouse cursor - The primary function is to move the mouse pointer on the screen.
2. Open or execute a program - Once you've moved the pointer to an icon, folder, or other object clicking or double clicking that object opens the document or executes the program.
3. Select - A mouse also allows you to select text or a file or highlight and select multiple files at once.
4. Drag-and-drop - Once something is selected, it can also be moved using the drag-and-drop method.
5. Hover - Moving the mouse cursor over objects with hover information can help discover the function of each object on the screen. For example, hover the mouse over the "hover" link to see an example.
6. Scroll - When working with a long document, or viewing a long web page, you may need to scroll up or down. To scroll, use the mouse wheel, or click and drag the scroll bar.
7. Perform other functions - Many desktop mice also have buttons that can be programmed to perform any function. For example, many mice have two side buttons on the thumb portion of the mouse the button closest to the palm can be programmed to go back on web pages.