Linked Data is a way to publish structured information on the Web, using well-defined properties with links related resources, all identified with accessible URIs.
Linked Data builds on (and includes) Semantic Web technologies like RDF, HTTP, REST and JSON-LD, and has a strong emphasis on openess and reuse of identifiers. Interoperability and ease of use has higher priority than reaching ideal semantic clarity.
Linked Data is also an important part of the Open Data movement, as it standardizes how to structure data and merging multiple disparate data sets is made possible using common identifiers and vocabularies.
This community's logo is adapted from the Linking Open Data cloud diagram 2014, by Max Schmachtenberg, Christian Bizer, Anja Jentzsch and Richard Cyganiak. http://lod-cloud.net/