From the grakn.ai website:
Grakn is a distributed hyper-relational database for knowledge-oriented systems. Grakn enables machines to manage complex data that serves as a knowledge base for cognitive/AI systems.
Graql is Grakn’s reasoning (through OLTP) and analytics (through OLAP) query language. Graql is a much higher level abstraction over traditional query language – SQL, NoSQL, or Graphs.