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Internet Services (Ch18) - Coggle Diagram
Internet Services (Ch18)
From a user point of view, every on-line application can be regarded as a service.
e.g. SaaS, PaaS, IaaS
SaaS
- Software as a Service
- on-demand software and is part of cloud computing
- e.g. Google Docs
PaaS
- Platform as a Service
- e.g. Facebook
IaaS
- Infrastructure as a service
- e.g. WiFi as a Service
Search engine
How does a search engine work?
- spider program / bot search web pages on the servers of Internet, extract information and create search index
- different search engines use different spider programs
- index and web pages are converted to database
- user enter search keywords and access program return results from database
- the search results are listed in an order based on an ranking algorithm (e.g. page rank)
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Besides Google, are there other search engines?
Types
- general search, e.g. Google
- specialized search, e.g. Google Scholar
- natural language e.g. Siri
Advance search techniques
- related:
- filetype:
- operators +, -, *
- nearby
- cached
- image search, date search
- site:
- intitle:
- allintitle:
- allinurl:
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Are all search results reliable and trustworthy?
Disinformation
- false information spread deliberately as fact to mislead the readers
Misinformation
- false, inaccurate or misleading information
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3 questions to ask:
- Who is the author?
- Where does the article come from?
- Is the article credible?
(research, not react)
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Email
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How to send batch email with undisclosed recipients?
Email structure
What are cc and bcc?
Is the sender address always correct?
Social media
Facebook, Instagram, newsgroup, forum, discussion group
Instant messaging, on-line chat, WhatsApp, Signal, Facebook Messenger
Video conferencing
- video captured by webcam transferred to server and then streamed to other users
- e.g. Zoom, Google Meet
E-commerce / Fintech
Electronic payment / wallet
Cryptocurrency
- e.g. bitcoin, ethereum
- blockchain: distributed ledger of digital money transactions
on-line shopping
- e.g. HKTVmall
- how is this different from face-to-face shopping
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E-government
What are the pros and cons of doing census online?
E-learning
What are the pros and cons of on-line learning?
Online entertainment
What are the pros and cons of on-line gaming / eSports?
Will cinemas be replaced?
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