Data.gov – (almost) all government data in one place!
Data.gov is a government website containing over 260,000 datasets about: Agriculture, Climate, Consumer, Ecosystems, Education, Energy, Finance, Health, Local, Government, Manufacturing, Maritime, Ocean, Public, Safety, Science & Research.
What is Open Data?
The term Open Government Data is associated with social initiatives that aim to help national governments prepare, organize and implement their public information ventures. Public administration collects large volumes of high quality data as part of activities routinely carried out by public entities. The intention of Open Government Data initiatives is to make public information accessible to citizens.
According to the interpretation  of the Open Knowledge Foundation:
the term “Open” means openness, in accordance with the Definition of Open Knowledge , and the most important determinant of openness is the ability to provide everyone with unrestricted access to data, its reuse and redistribution.
The term “Government Data” means all data and information created or registered by public administration or organizations subject to public administration.
Therefore, Open Government Data can also be seen as collaboration of experts in the field of open data with the government and public administration in the implementation of the mission of access to public information.
Open Government Data is one of the aspects of the concept of open government, pursuing the objectives of transparency of state bodies, engaging citizens in decision-making processes regarding the state and the openness of public institutions.