What is a Enterprise content management (ECM)?

From Wikipedia definition of ECM:

Enterprise Content Management (ECM) is any of the strategies and technologies employed in the information technology industry for managing the capture, storage, security, revision control, retrieval, distribution, preservation and destruction of documents and content. ECM especially concerns content imported into or generated from within an organization in the course of its operation, and includes the control of access to this content from outside of the organization's processes. ECM systems are designed to manage both structured and unstructured content, so that an organization, such as a business or governmental agency, can more effectively meet business goals (increase profit or improve the efficient use of budgets), serve its customers (as a competitive advantage, or to improve responsiveness), and protect itself (against non-compliance, law-suits, uncoordinated departments or turnover within the organization). In a large enterprise, ECM is not regarded as an optional expense, where it is essential to content preservation and re-usability, and to the control of access to content - whereas, very small organizations may find their needs temporarily met by carefully managed shared folders and a wiki, for example. Recent trends in business and government indicate that ECM is becoming a core investment for organizations of all sizes, more immediately tied to organizational goals than in the past: increasingly more central to what an enterprise does, and how it accomplishes its mission.