What are the Differences Between Relational and Graph Databases?

Relations in the relational databases are handled by the joins between the tables,These can be managed in two ways :either in a permanent declarative fashion by the use of foreign
keys, or in a temporary fashion by ad-hoc joins in our queries

Hierarchical data on the other hand, is often modelled with self joins

Whereas in Graph Databases the relationships ¬†physically exist on disk and they are named, directed, and can be themselves decorated with properties¬†This means if you chose to, you could look at the relationships on disk and see how they “join” entities. Relationships are therefore first-class entities in a graph database and are semantically far stronger than those implied relationships reified at runtime in a relational store.