usually an attachment .. when u open it it executes a virus ... if u are not expecting an email then dont open it is the safe thing to do ...
What are email viruses?free antivirus
Email is now the most common way that viruses are transmitted between computers. The most common mechanism for this is in the form of an ''attachment'' to the message. The attachment facility is normally used for emailing documents, images, and so on. However, it is also possible for attachments to contain programs which get run when the attachment is opened.
Your antivirus should be scanning any attachments before they are executed and you'll be fine.
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