Linked Data empowers people that publish and use information on the Web. JSON-LD is a way to create a network of standards-based, machine-readable data across Web sites. JSON-LD allows an application to start at one piece of Linked Data, and follow embedded links to other pieces of Linked Data that are hosted on different websites across the Web.
JSON-LD maybe signed using Linked Data Signatures.
JSON-LD is a lightweight Linked Data format. It is easy for humans to read and write. It is based on the already successful JSON format and provides a way to help JSON data interoperate at Web-scale. JSON-LD is an ideal data format for programming environments, REST Web services, and unstructured databases such as CouchDB and MongoDB.JSON-LD Examples
Other Information Sources#Just some other places to learn more:
- JSON-LD 1.0
- Using JSON-LD To Establish Semantic Linked Data 
- JSON-LD is used within Verifiable Claims
More Information#There might be more information for this subject on one of the following:
- JSON for Linking Data
- JSON-LD Examples
- Linked Data
- Linked Data Signatures
- Web Blog_blogentry_231115_1