History refers to the discipline concerned with the study of chronological ordening of events, based on critical examination of sources. In the broad sense of the word, history also refers to everything that has taken in the past, including all phenomena undergoing change. A example is the history of the Universe. It is based on a wide variety of sources, such as written and printed sources, e.g. interviews. But also unwritten sources from the archeology give information. Some approaches are more often common in some periods than others.

History follows the Prehistory. It is the current age humans use the invention of writing systems. History is a term that relates to the past as wel as the memory, discovery, collection, organiszation, presentation and interpretation of information about these events. Historians place all information in context using historical sources, like written documents, oral accounts, ecological markers and material objects, including art and artifacts. The word History comes from the Greek 'historia', meaning 'inquiry', 'knowning from inquiry' or 'judge'.

Historical study often focusses on events and developments that occur in particular periods of time. These blocks recieved names in order to allow to organizing ideas and classificatory generalisations. Those names can vary with geographical location. The dates of the beginning and end of a period can be different too. This is the reason why we always put a date with the time periods, knowing it can be diffrent from what you, the visitor, are used of using. Commonly are centuries and decades used. We try to explain the presented time period.

It is a difficult undertaking to map out history in a structured way. That is why we chose to give the main periods of history, several subdivisions. These offer us the option of grouping a place or given event. The evolution of man does not happen at the same time everywhere in the world. In this way we can also pay separate attention to different cultures.

History is divided in main four time periods: Ancient Age, Middle Ages, Modern Age and Contemporary Age. All ages get subdivisons based on their place or event on Earth.