This is a system for sending and receiving messages electronically over a
computer network, as between personal computers.

To send an email the sender and the recipient must have an email address.

An email address identifies an email box to which email mesages are delivered.

An example is John.Smith@example.com 

Creating an email address/account

 An email account is created using one of the email platform such as yahoo or gmail.

Let's see how to create a Gmail email address!

1. Go to www.gmail.com
2. Click Create an account.
3. The signup form will appear. Follow the directions and enter the required information, such as your name, birthdate, and gender.
4. Finally, review Google's Terms of service and Privacy policy, click the check box, then click Next step.
5. The Create your profile page will appear. Click Add a photo if you want to add a photo to your Google+profile. If you don't want to set a profile photo at this time, click Next step.
6. Your account will be created, and the Google welcome page will appear.

You may also watch the Video below.

https://www.youtube.com/watch?v=koJlF6YDqqA

Sending emails
Create an email account using one of the email platform such as yahoo or gmail.
Click compose , add the recipients’ email address, subject and the message.
You can also attach files to the message

An email attachment is a computer file sent along with an emailmessage. One or more files can be attached to any email message, and be sent along with it to the recipient. This is typically used as a simple method to share documents and images.

Click on the attach files icon and go to the file location,
Click on the file then select attach.
Click on send .

Receiving emails
Click inbox for the message to open.
Click on the message to read.
Click on the ‘Reply’ or ‘Forward’ or Delete buttons depending on your intended action

Adding an Email Signature

An email signature comprises a few lines of text placed at the bottom of outgoing mail. 

Add an Email Signature in Gmail

To set up a signature automatically added to emails you compose in Gmail:

• Click the Settings gear in your Gmail toolbar.
• Select Settings from the menu that will have appeared.
• Go to General
• Make sure the desired account is selected under Signature:
• Here, you can also Disable Gmail email signatures all together.
• Type the desired signature in the text field.
• Click Save Changes.

Gmail will now insert the signature automatically when you compose a message. Of course, you can edit or remove it before clicking Send.

Email Etiquette

Don't Write in All CAPITALS - Writing in all capitals can convey that you are shouting in your message, and nobody likes to be yelled at. 

Don't Use Email to Discuss Confidential Information.

Take Care with Abbreviation and Emoticons - Save abbreviations like LOL (laugh out loud) or IDK (I don’t know) for text messages among friends. Some may not understand your abbreviations. And while emoticons are fun, they just aren’t professional and you don’t know how the recipient will take them. Just like abbreviations, readers may not know what they mean. It's better to spell it out and write what you mean.

 Keep the subject direct and noticeable

 Make a courteous opening and closing

It's important to properly close an email. `Warm regards', `Thank you for your time', `Sincerely yours', `Looking forward to hearing from you'