Data Sharing encompasses the spectrum from making data available upon specific request to depositing data in an open and publicly accessible repository. It is important to know specifically what is required by a funder, journal, or institution. For example the Department of Energy's Statement on Digital Data Management defines Data Sharing as "...making data available to people other than those who have generated them. Examples of data sharing range from bilateral communications with colleagues, to providing, free unrestricted access to the public through, for example, a web-based platform."
In general, Open Data is data that is deposited in an open, publicly accessible repository. Specifically, the Open Knowledge Foundation summarizes Open Data as "A piece of data or content is open if anyone is free to use, reuse, and redistribute it- subject only to the requirement to attribute and/or share-alike". The full definition includes eleven detailed points that address issues such as access, reuse, redistribution, licensing, technological restrictions and more.