E-mail (English email, e-mail, from English electronic mail) is a technology and service for sending and receiving electronic messages (called "letters", "emails" or "messages") between users of a computer network (including - the Internet).
E-mail on the composition of the elements and the principle of operation practically repeats the system of ordinary (paper) mail, borrowing as terms (mail, letter, envelope, attachment, box, delivery and others), and characteristic features - ease of use, delay of message transmission, sufficient reliability and at the same time the lack of delivery guarantee.
Advantages of e-mail are: easily perceived and memorized by the person of the address type username @ domain-name (for example, firstname.lastname@example.org); the ability to send both plain text and formatted, as well as arbitrary files (text documents, media files, programs, archives, etc.); the independence of the servers (in general they refer to each other directly); sufficiently high reliability of message delivery; ease of use by people and programs, high speed of messaging.
Disadvantages of e-mail: the presence of such a phenomenon as spam (mass advertising and virus mailings); Possible delays in message delivery (up to several days); restrictions on the size of a single message and the total size of messages in the mailbox (personal for users).
Currently, any novice user can start a free email account, just register on one of the Internet portals.