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Let's talk a little history.

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It's hard to know where you're going
if you don't know where you've been.

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Charles Babbage is widely considered
the father of the computer.

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Babbage is credited with inventing the
first mechanical computers in the 1800s.

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Mathematician Ada Lovelace is credited
with publishing the first computer program

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in the 1840s, designed for
use on one of Babbage's early machines.

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But even after Ada Lovelace wrote
the first program, it would still be over

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a century before the first large scale
programmable computer was introduced.

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Built in 1945, the ENIAC was commissioned

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at the University of
Pennsylvania in Philadelphia.

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The ENIAC was 9 feet tall,
covered 1,800 square feet,

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weighed nearly 30 tons and cost $500,000.

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Adjusted for
inflation that's over $7 million in 2021.

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It sported an impressive clock
speed of 100,000 cycles per second.

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In other words,

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it could add two large numbers
together 5,000 times in one second.

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The first personal computers
were introduced in 1977 by three

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different companies known as the Trinity.

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One of those computers, the Apple II,
help launch the Apple computer company,

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known today for the Mac book line of
laptop computers and mobile devices,

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such as the iPhone and the iPad.

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In 1982, the Commodore 64 was born.

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Selling 17 million units,

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the Commodore 64 still holds the title as
the best selling computer of all time.

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Fast forward to now, the iPhone X was
released in 2017 compared to the 30-ton,

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basement size ENIAC, the iPhone X
weighs less than half a pound and

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it fits comfortably in your hand.

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It has a clock speed of 2.1
billion cycles per second and

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cost about $1,000 at
the time of this launch.

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To put that in perspective,
the iPhone is over 20,000 times

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faster than the ENIAC and
a tiny fraction of its size and costs.

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In fact, the mobile devices of
today can do things that even

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the most powerful computers of 20
years ago couldn't accomplish.

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For instance,
I have access to the Internet and

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the World Wide Web right
in the palm of my hand.

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Let's talk about them.

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The Internet is a global system of
interconnected computer networks to

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communicate between devices and
other networks.

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In other words, the Internet is a network
of networks, that consists of public,

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private, academic, business,
and government networks.

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It is completely reshaped the way
we communicate, shop, learn and

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conduct business.

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The World Wide Web was invented
by Tim Berners-Lee in 1989.

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And the public was first granted
access to this new network in 1991.

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The web allows us to access information
on the Internet using a web browser.

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I can visit a website like
teamtreehouse.com and

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click on hyperlinks to
access other web pages.

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In the next video, we talked about
different computer components,

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hardware, software, storage.

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Oh My! Stay tuned.