Companies lease their computer resources from cloud vendors instead of buying their own. Its much cheaper and information can be accessed from anywhere.
Elastic
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The vendors can add or remove resources depending on your needs. You only pay for what you use.
Leasing
IaaS Ex. EC2
PaaS Ex. Azure
SaaS Ex. iCloud
Pooled
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The same hardware and software can be shared by many clients. They need the resources at different times like April for accountants and September for universities.
The Internet
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Initiated by the Department of Defense in 1969. First network is ArpaNet. Later CSNet, BitNet, AOL, etc. In 1989 they could connect and form the Internet.
IP Address
TCP/IP
Protocols
FTP
HTTP
SMTP
Network of Networks
Network
PAN
LAN
LAN Device
Router
Switch
Access Point
Protocols
Ethernet/IEEE 802.3
WiFi/IEEE 802.11
WAN
ICANN
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The Internet Corporation for Assigned Names and Numbers i
Domain Names
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Kean.edu or amazon.com are domain names
URL
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http://www.kean.edu/~tabraham
Services
WWW
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Invented by Tim Berners-Lee in 1991. The dot com boom used the web to sell stuff.