1. Computer components
is a programmable machine that receives input, stores and manipulates data, and provides output in a useful format.
Computer
The computer programs (sequences of instructions) that tell the computer what to do in response to a command or some event.
Hardware
Software
The physical components (electrical circuits) that make up the computer
System
Memory
holds the data that the computer will process and the instructions that indicate what processing is to be done.
Processor
Application
These devices translate electronic signals into mechanical motion or light (or vice versa) so as to communicate with people
Central Processing Unit (CPU) or microprocessor, controls the operation of the computer and performs its data processing functions.
consists of operating systems, language translators, and utility programs. Coordinates the various parts of the computer system and mediates between application software and computer hardware.
programs to perform specific functions specified by end users. Must operate through the system software to work
Input/Output

2. Arithmetic/ logic unit (ALU)
Hardware
Keyboard
Mouse
Touch pad
Scanner
Web camera
Microphone
Printer
Speakers
Headphones
Monitor
Source and destination addresses are sent over the address bus to identify a particular location in memory or input/output port
Address bus
RAM random-access memory
ROM read-only memory
MEMORY
I/O DEVICES
Main
Input
CPU
Secondary
Output
Control unit (CU)
reads and interprets the program instructions, transforming them into a series of control signals which activate other parts of the computer
Arithmetic/ logic unit (ALU)
two way path for transferring data and instructions in and out of the microprocessor
Data bus
is not directly accessible to the CPU, requiring the use of computer input/output channels.
Magnetic disk (Hard disk,Flash)
Optical media (CD, DVD )
Control Lines bus
perform the set of arithmetic and logic operations: adding, subtracting, multiplying, dividing and etc.
The control bus synchronizes system events like memory access, system interrupts, I/O, etc

3. a software, which makes a computer to actually work, enables all the programs we use, organizes and controls the hardware, acts as an interface between the application programs and the computer hardware.
Examples: Windows, Linux, Unix and Mac OS, etc.,
Software
Operating system
converts high level language into low level language & vice versa as computer can only understand in binary format
Language translator
help to perform specific tasks in the areas:
Data management
Documentation
Collaborative and Content access
Entertainment
Media development and etc.
Utility programs
Prewritten programs that can be used rapidly when requested for routine, repetitive tasks:
Copying, setting up new files, deleting old files, formatting diskettes and so on
is a programming language or programming environment designed with a specific purpose in mind, such as the development of commercial business software (DBMS)
specially written code used for writing applications. (C++, Java).
Programming languages
Fourth-generation languages
Software packages and desktop productivity tools