The keys on the keyboard are as follows:-

Sr. No.	Keys	Description
1.	Typing Keys	These keys include the letter keys (A-Z) and digit keys (0-9) which generally give same layout as that of typewriters.
2.	Numeric Keys	It is used to enter numeric data or cursor movement.Generally,it consists of a set of 17 keys that are laid out in the same configuration used by most adding machines and calculators.
3.	Function Keys	The twelve function keys arepresent on the keyboard which are arranged in a row at top of the keyborad.Each function key has unique meaning and is used for some specific purpose.
4.	Control Keys	These keys provide cursor and screen control.It includes four directional arrow keys.Control keys also include Home,End,Insert,Delete,Page Up,Page Down,Control (Ctrl),Alternate(Alt),Escape(Esc).
5.	Special Purpose Keys	Keyboard also contains some special purpose keys such as Enter,Shift,Caps Lock,Num Lock,Space bar,Tab and Print Sreen.

All types of computers follow a same basic logical structure and perform the following five basic operations for converting raw input data into information useful to the users:-

Sr. No.	Operation	Description
1.	Take Input	The process of entering data and instructions into the computer system.
2.	Store Data	Saving data and instructions so that they are available for processing as and when required.
3.	Processing Data	Performing arithmetic and logical operations on data in order to convert them into useful information.
4.	Output Information	The process of producing useful information or results for the user such as a printed report or visual display.
5.	Control the Workflow	Directs the manner and sequence in which all of the above operations are performed.

Abbreviation related to computer

1.RAM:-Random Access Memory
2.SRAM:-Static Random Access Memory
3.DRAM:-Dynamic Random Access Memory
4.ROM:-Read Only Memory
5.PROM:-Programmable Read Only Memory
6.EPROM:-Erasable Programmable Read Only Memory
7.EEPROM:-Electrically Erasable Programmable Read Only Memory
8.OMR:-Optical Mark Recognition
9.MICR:-Magnetic Ink Character Recognition
10.CRT:-Cathode Ray Tube
11.LCD:-Liquid Crystal Display
12.TFT:-Thin Film Transistor
13.LED:-Light Emitting Diode
14.USB:-Universal Serial Bus
15.SCSI:-Small Computer System Interface
16.GUI:-Graphical User Interface
17.CUI:-Character User Interface
18.DBMS:-Data Base Management System
19.RTOS:-Real Time Operating System
20.OS:-Operating System