E-mail & Search Engines

1. Email & Search Engines
Dr.M.Deivam
Assistant Professor (Contract)
Department of Education
The Gandhigram Rural Institute (Deemed to be University)
Gandhigram, Dindigul District, Tamil Nadu

2. Introduction
• Electronic mail (also known as email or e-mail) is one of the
most commonly used services on the Internet, allowing people
to send messages to one or more recipients.
• Email was invented by Ray Tomlinson in 1972.
• Email (electronic mail) is a way to send and receive messages
across the Internet.
• It has changed the way we communicate. Millions of people all
over the world uses this method of communication every day,
and the number keeps growing.

3. Contd.,
• Communicating by email is cheap (costs next to nothing) and fast (in a
matter of seconds or minutes), compared with conventional mail (letters)
that needs stamps (can cost a substantial sum), and takes days or weeks to
reach.
• We can send and receive text, document files, image files, audio files- in
fact, any file at all. One big advantage is, unlike using the telephone, the
recipient does not have to be present when a message is sent to them.
They can read incoming mail and reply (if necessary) at their own
time.

4. Parts of an Email Address
•Username: The first part of an email address is the
username. This is the unique name that you or your ISP
select.
•@Symbol: An “at” or “@” symbol is the second part of
an email address. This fits in between the username and
the domain of your email address.

5. Contd.,
• Domain: The last part of an email address is the domain, which can be
broken down into two portions: the mail server and the top-level
domain. The mail server is the server hosting the email account. For
example, Gmail email accounts use “gmail” as the server name. The
top-level domain is the extension such as .com, .net or .info. Emails
from educational institutions often have the .edu extension, while
employees of a government agency use a .gov extension.

6. Parts of an email message
Headers: The message headers contain information concerning the sender
and recipients. The exact content of mail headers can vary depending on the
email system that generated the message.
Subject: Subject is a description of the topic of the message and displays in
most email systems that list email messages individually.
Sender (From): This is the sender's Internet email address. It is usually
presumed to be the same as the Reply-to address, unless a different one is
provided.
Date and time received (On): The date and time the message was received.

7. Contd.,
Reply-to: This is the Internet email address that will become the
recipient of your reply if you click the Reply button.
Recipient (To): First/last name of email recipient, as configured by the
sender.
Recipient email address: The Internet mail address of the recipient, or
where the message was actually sent.
Attachments: Files that are attached to the message.
• Body: The body of a message contains text that is the actual content. The
message body also may include signatures or automatically generated
text that is inserted by the sender's email system.

8. Email advantages:
 Productivity tools: Email is usually packaged with a calendar, address book,
instant messaging and more for convenience and productivity.
 Access to web services: If you want to sign up for account like Facebook, or
order products from services like Amazon, you will need an email address so
you can be safely identified and contacted.
 Easy mail management: Email service providers have tools that allow you to
file, label, prioritize, find, group, and filter your emails for easy management.
You can even easily control spam, or junk email.

9. Contd.,
Private: Your email is delivered to your own personal and private
account with a password required to access and view emails.
Communicate with multiple people: You can send an email to
multiple people at once, giving you the option to include as few as
or as many people as you want in a conversation.
Access anywhere at any time: You don’t have to be at home to
get your mail. You can access it from any computer or mobile
device that has an Internet connection.

10. Search Engines
• Search engine is a web software program or web based script available
over the Internet that searches documents and files for keywords and returns
the list of results containing those keywords.
• Search engines are programs that search documents for specified keywords
and returns a list of the documents where the keywords were found. A search
engine is really a general class of programs, however, the term is often used to
specifically describe systems like Google, Bing and Yahoo Search that enable
users to search for documents on the World Wide Web.

11. Contd.,
• Today, there are numbers of different search engines available on the Internet, each
with their own techniques and specialties.
• Search Engine Optimization is a technique to improve visibility of a website in
search engine.
• Typically, Web search engines work by sending out a spider to fetch as many
documents as possible. Another program, called an indexer, then reads these
documents and creates an index based on the words contained in each document.
• Each search engine uses a proprietary algorithm to create its indices such that,
ideally, only meaningful results are returned for each query

12. Types
 Full Text Search Engine: Full Text Search Engine retrieves information from internet, establish database and
retrieve the records according to user’s query. It can be divided into two parts: first one has its own crawler. Another
one is to hire other search engine’s database.
 Directory Search Engine: We cannot call it a true search engine. It retrieves all the entries of directory listing.
 META Search Engine: It provides search results from multiple search engines simultaneously according to user’s
query.
 Vertical Search Engine: Vertical Search Engine focuses on specific search field and search demand.
• Search Engine is really useful tool in present era of web. There are many of search engines available in market,
but most popular search engine is Google.

13. Thank You