unsolicited e-mail sent for advertising purposes is called as Spam.
Unwanted email messages that are typically sent in bulk to a wide list of recipients are referred to as spam or junk email. Spam can be transmitted by actual people, but more frequently it is sent by a botnet, which is a network of computers (sometimes known as "bots" or "spambots") that have been infected with malware and are under the control of one attacking party (bot herder). Spam can be sent via social media or SMS messaging in addition to email.
Spambots are employed by spammers to scour the internet in search of email addresses that may be used to build email distribution lists. The lists are used to simultaneously deliver spam to large numbers of email addresses, typically hundreds of thousands.
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