Computer networks connect computers together through cables or phone lines. There are two main types - local area networks which connect computers in a small area like a home or classroom, and wide area networks which connect computers over larger distances. The internet is a global network of connected computers that began as a military communication system and later allowed commercial use through internet service providers. The world wide web allows people to share and view web pages containing text, images, video and sound through browsers, while search engines help users find information on the web. When using computers and networks, people should protect private data, avoid viruses, be careful sharing personal information online, and respect intellectual property laws.

2. Computer Networks
-a group of computers connected by cables or
telephone lines
• 2 Types:
– Local Area Network (LAN) - A set of
computers connected in one classroom or
home
– Wide Area Network (WAN) - computers
connected across larger distances

3. The Internet
• A network of host computers that extends
around the world
• Began in 1969 as a military communications
system
• In 1993, businesses were allowed to sell
Internet connection. These businesses are
known as Internet service providers (ISPs)

4. World Wide Web
• Developed in 1989
• Allows people to display and view files, called
pages, on the Internet
• Web pages can include text, pictures, video,
and/or sound
• Software programs called search engines
allow people to search through the Web

5. Using Computers Safely
• Protect Private Data
– Share personal information only on networks that
require authorization and use security software to
keep out unwanted users
– Use networks that encrypt information.
Encryption is a process of coding information so
only the intended user can read it.

6. Using Computers Safely
• Avoid Viruses
–Computer viruses are programs
that interfere with the normal
operation of a computer
–It can destroy stored data or even
disable a computer

7. Using Computers Safely
• Protect Personal Safety
– Never give your name, address, or
telephone number
– Chat rooms allow multiple users to
exchange messages simultaneously
– However, users are not screened, so you
do not know who you’re chatting with

8. Using Computers Safely
• Respect Intellectual Property
– Intellectual property can be an idea or creative
work, such as a book or musical performance
– Governments protect intellectual property by
granting copyrights and patents
– Violating copyrights or patents can result in fines
or other penalties

9. Online Safety
• https://www.youtube.com/watch?v=Cnc4LaevRBw
• https://www.youtube.com/watch?v=9waE2A-uIxQ

10. Review
• What is a computer network?
• What are the advantages of computer
networks?
• What are three kinds of personal information
that might be shared on a computer network?
• What is one way to protect personal
information when using a network?