rankingCoach Glossary


The cache is a buffer memory where data is temporarily stored and also can be issued again quickly. In the field of search engine optimization, cache is referred to as the property of search engines to be able to display even temporarily technically unavailable web pages. In this case, the information is retrieved from the so-called buffer. read full article

Canonical tag

The canonical tag is a link tag that is used to avoid duplicate content and is inserted in the non-visible header area of an HTML document. By means of this meta tag, the web page owner can determine which URL should be included in the index if several URL's refer to pages with the same content. read full article

Cascading Style Sheets (CSS)

Cascading style sheets allow a strict separation of content and presentation of a website. While content is issued from the HTML code, the layout properties are sourced out to a separate file via CSS. These include the positioning of elements, font and font size, line spacing, colors, etc. read full article


A click is when you select a link on the Internet. The number of clicks is also used to measure the number of visitors or page views. read full article

Cost per Click (CPC)

The abbreviation CPC stands for "cost per click" and is an important key figure in online marketing Those who want to measure costs and benefits for their advertising campaign will find the CPC a unit of measurement for this purpose. read full article

Click Through Rate (CTR)

The click through rate (also called click rate) is a key figure in online marketing and describes the ratio of ad insertions to the frequency of clicking. The click through rate is used to measure the advertising effect of an online marketing measure. read full article

Click popularity

Using the so-called click popularity, a statement can be made about how often a page provided by a search engine was clicked on. However, this measurement method is no longer used today, because it is now regarded as obsolete. read full article


"Cloak" in this sense refers to the term for a cover. Cloaking describes a technology in search engine optimization that supplies content specially made for machines. Search engines strive to turn off cloaking. They therefore remove websites from their directory that run cloaking. read full article

Closed Loop

Closed loop refers to cross-linking where web pages are exceedingly linked between each other In the process, a user is taken back and forth between several web pages. This causes the number of visitors to the linked web pages to be driven up. Closed loops are not tolerated by search engines and are included under BlackHat. read full article

Content Management System (CMS)

A CMS helps the user to create their own website. The main task here is the management and representation of text or multimedia content for web browsers. Most CMS are user-friendly and can be operated without programming knowledge. They help to edit and organize various content on a web page. read full article


Cookies are text files that are used to (temporarily) store data in the browser. Among other things, they are used to store specific settings of web pages in the browser so that when the web page is revisited, it will load faster. Cookies can also transfer to the web page operators' server the surfing behavior of the web page users. read full article

Conversion Rate

The conversion rate indicates how many visitors to a web page actually make a purchase or carry out an action desired by the website operator. The conversion rate is calculated from the formula "buyers / visitors x 100 (%)." The effectiveness of advertising efforts can be determined with the conversion rate. At the same time, it is considered a measure of the optimization of web pages with regard to user-friendliness. read full article


The visitor counter is displayed as a counter on web pages. The counter setting varies. If no cookie is applied, it counts every web page access. If the counter applies a cookie, for example only every first-time visitor will be counted or every visitor within a certain time period will be counted. read full article

Catalog (directory)

Web catalogs or web directories are comparable to trade directories, such as the "yellow pages." Companies, entrepreneurs or even individuals can register their websites here or suggest an entry with the operator of the catalog, which must then be approved. read full article


Web directories and web catalogs (see catalog) are usually divided into categories, which thematically structure entries and links. A page entry should be made in a matching category to ensure optimal findability and user-friendliness. read full article


Cross-linking is the mutual linking of web pages. Example: A cross-linking exists between pages A, B and C if A is linked to B and C, B is linked to A and C, and C is linked to A and B (also see: link exchange). read full article