Spam in the most general sense means "internet garbage", sending commercial information and advertising or other forms of commercial communications to persons that didn`t confirm the desire to receive them. Spam can be distributed in the Internet via: 1. E-mail. 2. Service Instant Messaging and SMS. 3. Social Networks. 4. Blogs and forums with free editing 5. Search engines. The so-called "web spam" or "search engine spam" or "spamdexing" - a way of manipulating the results of the issuance of a search engine. We will focus on the most interesting for us the type of spam - spamdexing. How spamdexing is used The term "spam" in the general sense is now a shade of stalking and unauthorized act in relation to the Internet user, which is made for the purpose of commercial gain. Spamdexing aims to deceive not only the user, but also a search engine and their robots. In the ranking of search engine affects a lot of factors. Spamdexing effect on all of these factors in an extreme form, brings every element of site optimization to transcendental level, from which the system begins to "vomit" and it sees the site as a phishing service. Types of spamdexing Site overspam may concern: • Key words (content) • Links • Title and Meta tags (layout) • Domain name Keyword stuffing This type of spam is characterized by frequent unnatural content keywords in the text. Google in its guide for webmasters says that an excessive number of keywords can be confusing for users and may adversely affect the site's ranking. Domain name stuffing Yes, the domain can also be spammed. Some developers manage to insert the keywords in the domain name, even. Its name, age, history, and other characteristics affect to SEO. Title and Meta-tag stuffing Spam of titles and meta tags regard to the use of keywords and incorporating them in large quantities in the meta tags, title attributes and other elements of the layout. For more detail, we will discuss later in the following articles. Link spam Link farms - Link farms are tightly-knit communities of pages referencing each other, also known facetiously as mutual admiration societies. Use of links farms has been greatly reduced after Google launched the Panda Update back in February 2011, making significant improvements in its algorithm to detect link farms meant to game ranking. Hidden links - That are visible only to to robots. Hidden links redirect to external resources that are not related to the site, and users are given other pages. How search engine reacts to spam Spammed site – is very relative and subjective concept. In the most general sense, it means a surplus of optimization of various elements of the site with a view to promotion in search results. Spammed site - not a random figure, it is the result of meaningful actions to fool the system and get out at the top. Website ceases to bear practical use, robots see it and lower the position of the site in the SERP. You can take months or years in an attempt to regain the trust of the search engine. Any kind of spam - it is a bad method of promotion, that the search engine don`t do not encourage. From this we make some conclusions: • Search engines know and use the concept of "spammed sites" and "spam". • Search engines can detect sites that abuse optimization, and punish them with lows of positions • Search engines look at the site globally and can change their attitude. How to avoid the spammed site? If you put meaningful internal links, you use the appropriate context keywords, titles that reflect the content of the article, write texts for people first of all, then you do not get spammed site. You can check the spammed site: In Google Webmasters. In the page code or visually on the site. Through the analysis of inbound links and internal link structure. Through special programs. They give a rough idea of your level of optimization.