Spam is unsolicited junk email sent out over the Internet. Technically, it's Unsolicited Bulk Email, or UBE. Spam is sent without permission to thousands of recipients at once. Most spam is advertising for dubious products, get-rich-quick schemes, and adult content.
Another method spammers use to acquire your email address is through your browser. You may have entered your email address when you first installed your Web browser. When your browser opens a page on the Web, the site can query your browser for your email address.
How do I prevent spam in the future?