Such digitally
recorded collections are kept in digital repositories, which are
different from digital libraries in several noteworthy ways. Most
importantly, they serve a different purpose: the data in the digital
repositories can be mined or processed using different techniques
in order to answer different sets of research questions, and thus
digital repositories constitute a vital part of a country’s cyber
infrastructure. Digital repositories are sometimes also called
digital archives but archives contain a particular type of
documents, arranged and stored in explicit ways, often for legal
requirements.