There are two types of Meta Tags like Meta Description and Meta Keyword tags. Various search engines might show the Meta description as part of search results, but Meta keywords tags not appear in search results.
SEO practices are categorized in two groups:
- Method that search engines suggest as element of high-quality design referred to as White Hat SEO.
- Method that search engines not allow and try to reduce the result of referred to as Black Hat or spamdexing.
SEO is activity of optimizing single page or entire website in order to prepare them more search engine friendly, therefore getting higher positions in search results.