GAP (Google Advertising Professional) – GAP (Google Advertising Professional) is a free program which Google is offering to Google Adwords certified professionals. It allows someone to easily start, manage and analyze multiple campaigns on Google Adwords.

Google (www.google.com) – Google is the king of the hill, the biggest search engine, with more than 50% market share. It was founded by Larry page and Sergey Brin back in 1998 and it continuously grow up ever since. Nowadays it is based in Mountain View, California and has close to 15,000 employers all over the world. In the last years Google start offering a lot of other services to its users: G-mail, Google Video and You Tube, Google Earth, Google Docs and many others.

Google Analytics (www.google.com/analytics/) – Google Analytics is a free tool offered by Google which allows a site owner to see details statistics regarding their visitors (like number of unique visitors, number of visits, number of page views).

Google bombing– Google bombing is a combined auctioned of more site / persons that link to a certain site with the same anchor text; this may result in a top ranking for that page for the used anchor text. It affects all major search engines, but the fast and biggest influence is visible on Google (that’s where the name comes from). The most common case of Google bombing was when during the 2004 U.S. Presidential Elections George Bush’s web page was ranked as number one page in all major search engines for the term “miserable failure”. It is also called link bombing.

Google bowling – Google bowling is a black hat SEO tactic that tries to get the competitor’s sites out of search engines by linking from tons of questionable sites to them. This approach may be successful when it targets new, unestablished sites; on the other side it is completely useless when it comes about old sites which have a good level of trust in search engines.

Google cache – Google cache for a web page is a copy of that page stored on Google’s server. When analyzing a page or building the SERPS for a certain search term Google analyze the cached page and not the original page. So, using other words, a site is ranked based on what is stored on Google’s cache server and not on what is on the live page; that’s why it takes some times for a change done on a web page to have any effect on SERPS.

Google dance –Google dance is a term that describes the fluctuations in Google’s index size and search engine results at the moment when Google indexes are updated. During this updates a site position may fluctuate a lot and may be different on different Google Data Centers.

Google sitemap – Google sitemaps are XML files that contain all URLs available on a site; for each of them some additional information (relative importance within the site, last update time and how frequently the page is modified) can be provided. Google sitemaps appeared as an alternative solution to help Google bot index all pages of a site. For a small site it may not be useful and a good internal linking structure is more than enough; however for huge, database driven sites Google sitemaps are a must.

Google supplemental index – Google’s supplemental index is a secondary database that stores those pages that didn’t made it to the main index (ex: orphan pages, duplicate content pages, un-trusted pages, excessively long URLs, etc). Normally these pages don’t appear in SERPS, however they may appear in some isolated cases (ex: if there are no or very low number of pages in Google’s main index for the searched key phrase).

Google Toolbar – Google Toolbar is a browser add-on, available for both Internet Explorer and Mozilla Firefox. Its main feature when it comes about SEO is the fact that it displays the page rank of the visited web site. Google may use it for tracking users behavior (ex: which sites they’re visiting, how much time they spend on each site, etc) and in the future this may be an (important) factor in Google’s algorithm. Among his many feature are: direct Google search bar, Google account sign it button, pop-up blocker, and spell checker.

Google Traffic Estimator - Google Traffic Estimator is a free web tool offered by Google, which estimates the number of visitors a site can receive from Google Adwords for a particular keyword and the average cost for each visitor. Statistics show that usually a site get less visitors than the numbers showed by Google Traffic Estimator.

Google Trends – Google Trends is a free web tool offered by Google, which shows a graph with the evolution of search popularity for a particular search term. Statistics can be narrowed down by Country, city and language.

Googlebot – Googlebot is the name of Google’s robot / bot.