Introduction to computer science dessalegn Mequanint Yehuala Foreword

Unit 3: The Internet
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Activity Conclusion
Over the years, search engines have become one of the most critical features of the Internet.
Millions of people around the world use search engines almost on regular basis. The benefits
of search engines to both individuals and society is huge. They have made the web a very
critical resource repository of our time. They are the most popular and widely used tool to find
information online.
There are ongoing efforts to make the Internet beyond the regular use, this comes in the
form of the Internet of Things(IoT for short). IoT generally refers to scenarios where network
connectivity and computing capability extends to objects, sensors and everyday items not
normally considered computers, allowing these devices to generate, exchange and consume
data with minimal human intervention.
Assessment: Reflective Activities
• What do search engines do? Give examples of commonly used search engines.
• Why search engines keep an index of words?
• In order IoT becomes an instance of the more general class of cyber-physical
systems, what devices need to be integrated?
Answers:
• They all perform three basic tasks:
– They search based on words
– They keep an index of the words they find, along with where they find
them.
– They allow users to look for words or combinations of words found in
that index.
• The index helps search engines to retrieve a document quickly much like indexes
in a book do.
• sensors and actuators

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Introduction To Computer Science
54
Learning Activity: Creating a summary for the unit 
Introduction
In this activity you are required to summarize the unit’s content with words not exceeding 50.
Just focus on the main elements discussed in the unit such as the Origin of the Internet, the
application of the Internet and trends in Internet use.
Activity Details
Summarizing the whole idea of a content of several pages( in this case 11 pages) in a few
words among other things requires writing skills. In this activity you need to be more specific as
well as brief in incorporating the most important elements of the unit’s content in the summary.
You need to write them in your own words, coping the topics idea in a verbatim way is not
allowed.