Spam is a term used to describe aggressive marketing and advertising tactics that overload a system or annoy a webmaster. If you have checked your email only to find hundreds of unknown emails from various companies, then you have dealt with spam before.
Web hosting spam is slightly different than email spam, however, because it involves someone spamming your web site, not your email address. Fortunately, your web hosting account will include anti-spam tools that make it difficult for spam to affect your web site negatively.
If you want your web site to perform optimally, you will need to prevent spam from cluttering your web server’s resources. Be sure to do research on how to prevent and stop spamming from overflowing your web mail and web sites.