Archives are made up of records (AKA primary source documents) which have been accumulated over the course of an individual or organization's lifetime. For example, the archives of an individual may contain letters, papers, photographs, computer files, scrapbooks, financial records, diaries or any other kind of documentary materials created or collected by the individual--regardless of media or format. The archives of an organization (such as a corporation or government), on the other hand, tend to contain different types of records, such as administrative files, business records, memos, official correspondence, meeting minutes, and so on.

In general, archives of any individual or organization consist of records which have been especially selected for permanent or long-term preservation, due to their enduring research value. Archival records are normally unpublished and almost always unique, unlike books or magazines, in which many identical copies exist. This means that archives (the places) are quite distinct from libraries with regard to their functions and organization, although archival collections can often be found within library buildings.

Archives are sometimes described as information generated as the "by-product" of normal human activities, while libraries hold specifically authored information "products".

A person who works in archives is called an archivist. The study and practice of organizing, preserving, and providing access to information and materials in archives is called archival science.

Archivists tend to prefer the term 'archives' (with an S) as the correct terminology to serve as both the singular and plural, since 'archive,' as a noun or a verb, has meanings related to computer science.

Archive Users and Institutions

Historians, genealogists, lawyers, demographers, and others conduct research at archives. The research process at each archive is unique, and depends upon the institution in which the archive is housed. While there are many different kinds of archives, the most recent census of archivists in the United States identified five major types: academic, for profit (business), government, non profit, and other.

Academic Archives

Archives existing in colleges, universities, or other educational facilities are usually grouped as academic archives. Academic archives typically exist within a library, and duties may be carried out by an archivist or a librarian. Occasionally, history professors may run a smaller academic archive. Academic archives exist to celebrate and preserve the history of their school and academic community. The inventory of an academic archive may contain items such as papers of former professors and presidents, memorabilia related to school organizations and activities, and items the academic library wishes to remain in a closed-stack setting, such as rare books or thesis copies. It is always a good idea to contact an academic archive before visiting, as the majority of these institutions are available by appointment only. Users of academic archives are often graduate students and those wishing to view rare or historical documents for research purposes. Many academic archives work closely with alumni relations to help raise funds for their library or school. Because of their library setting, a degree certified by the American Library Association is preferred for employment in an academic archive in the USA.