E-Mail stands for Electronic Mail. E-Mails are used to send and receive messages over a computer network using different clients such as Outlook, Gmail etc.
The technology has existed since early 1970's but emailing was also the term used for faxing so it is unkown when the term was first used. The first e-mail was sent in 1971 by Ray Tomlinson, who worked as an engineer.
Email messages are sent using the SMTP server which processes outgoing messages.
Email messages are receives using IMAP and POP3 which processes incoming messages.
Possible abuse of Email's is people sending spam. These type of Email's go into your junk folder but sometimes may come up on your main inbox.
There are also many potential threats and hazards which come with E-mails. One of these is that people can spread viruses which can infect your computer through them. This can be avoided by having an antivirus installed on your computer. Another hazard is when you receive E-mails that claim to be your bank account. This is called phishing.You should never trust these types of E-mails as they are not safe and you should never give out your bank account details if you are not sure if the E-mail is legitimate.