A computer system consists of hardware and software components, with the operating system being a key software element that manages programs. It is defined as an electrical device capable of accepting input, storing, processing data, and producing information. The document highlights the evolution of computers as well as their important features, including processing power, multitasking abilities, storage capacity, and data transfer mechanisms.

1. What is a Computer System?
A computer system is made up of hardware components that have been carefully chosen
to work well with the software components or programs that operate on the computer.
This is also one of the major topics for class 11 information practices. The key software
element is the operating system (OS), which looks after and supports other programs that
can run on a computer. In its simplest form, a computer system is an electrical apparatus
that can be programmed to accept input, store data, retrieve data, process data, and
produce information.

2. Evolution of Computer
In the 17th century, mechanical calculators like Pascaline emerged, leading to Charles
Babbage's conceptual Analytical Engine in the 19th century. While teaching computer
systems in online information practices for class 11 students will learn the basics and
evolution of computers. Students can learn multiple things of computers in online
learning classes.

3. Important features of Computer System.
Some of the important Features of computer system are given below. This is the most important
topic in online information practices for class 11.
Processing Power
· Speed: Computers can process data and execute instructions at incredibly high speeds,
measured in gigahertz (GHz) or teraflops (TFLOPS) for supercomputers.
· Multitasking: Modern computers can handle multiple tasks simultaneously, switching
between applications efficiently.

4. Important features of Computer System.
Storage Capacity
· Primary Storage (RAM): Provides high-speed data access to the CPU for running
applications and the operating system.
· Secondary Storage (Hard Drives, SSDs): Offers vast storage capacity for files, software, and
the operating system, measured in terabytes (TB) or petabytes (PB) for large-scale systems.
Data Transfer
· Data Bus: the internal route taken by data as it moves through the computer. Additionally,
the amount of data that may be transferred at once, which is commonly measured in bits.
· Input/Output Ports: Various ports (USB, HDMI, Ethernet, etc.) enable connections to
external devices and networks, facilitating data transfer.