Answer :

Index-free adjacency means each vertex in a graph database contains a pointer to all connected vertices. For navigating interconnected data, graph databases are substantially more effective than conventional relational databases.

They have carefully optimized their data storage and query processing for this use case, and one feature in particular—index-free adjacency—is essential for achieving such improved speed.

A graph database must use index-free adjacency, which calls for connected nodes to actually "point" to one another in the database. In other words, any database that, when viewed from the user's point of view, behaves like a graph database (i.e., exposes a graph data model through CRUD operations) is considered to be a graph database. Considering the enormous performance benefits of index-free adjacency, graph databases that make use of index-free adjacency as native graph processing is preferred.

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