Marxists Internet Archive (also known as MIA or Marxists.org) is a non-profit website that hosts a multilingual library (created in 1990) of the works of Marxist, communist, socialist, and anarchist writers, such as Karl Marx, Friedrich Engels, Vladimir Lenin, Leon Trotsky, Rosa Luxemburg, Che Guevara, Mikhail Bakunin, and Pierre-Joseph Proudhon, as well as that of writers of related ideologies, and even unrelated ones (for instance, Sun Tzu and Adam Smith).

The collection is maintained by volunteers, and is based on a collection of documents that were distributed by email and newsgroups, later collected into a single gopher site in 1993.

It contains over 53,000 documents from over 600 authors in 61 languages.

Marxism is a method of socioeconomic analysis that analyzes class relations and societal conflict using a materialist interpretation of historical development and a dialectical view of social transformation.

It originates from the mid-to-late 19th century works of German philosophers Karl Marx and Friedrich Engels.

History (from Greek, historia, meaning "inquiry, knowledge acquired by investigation") is the study of the past as it is described in written documents.

Events occurring before written record are considered prehistory.

It is an umbrella term that relates to past events as well as the memory, discovery, collection, organization, presentation, and interpretation of information about these events.

Scholars who write about history are called historians.

Open content is a neologism coined by David Wiley in 1998 which describes a creative work that others can copy or modify.

The term evokes the related concept of open source software.

Language is the ability to acquire and use complex systems of communication, particularly the human ability to do so, and a language is any specific example of such a system.

The scientific study of language is called linguistics.

Questions concerning the philosophy of language, such as whether words can represent experience, have been debated since Gorgias and Plato in Ancient Greece.

Thinkers such as Rousseau have argued that language originated from emotions while others like Kant have held that it originated from rational and logical thought.

20th-century philosophers such as Wittgenstein argued that philosophy is really the study of language.

Major figures in linguistics include Ferdinand de Saussure and Noam Chomsky.