What Are the Types of Graphs in Data Structure?


Heather Bennett

When working with data structures, graphs are an essential concept to understand. A graph is a non-linear data structure that consists of nodes and edges.

The nodes, also known as vertices, represent the entities, while the edges represent the relationships between these entities. In this article, we will explore different types of graphs commonly used in data structures.

1. Undirected Graph:

An undirected graph is a type of graph where the edges have no direction.

This means that the relationship between two nodes is bidirectional. If there is an edge connecting node A to node B, then there is also an edge connecting node B to node A.

2. Directed Graph:

A directed graph, also known as a digraph, is a type of graph where the edges have a direction.

In this type of graph, each edge has an associated direction from one node to another. It represents a one-way relationship between nodes.

3. Weighted Graph:

In a weighted graph, each edge has an associated weight or cost assigned to it.

These weights can represent various measures such as distance, time, or any other relevant factor depending on the problem at hand. Weighted graphs are commonly used in applications like route planning and network optimization.

4. Unweighted Graph:

An unweighted graph is a type of graph where all edges have equal weight or no weight at all. In other words, there are no additional values attached to the edges apart from their existence.

5. Cyclic Graph:

A cyclic graph is a type of graph that contains at least one cycle or loop. A cycle occurs when there is a path that starts and ends at the same vertex without visiting any other vertex more than once.

6. Acyclic Graph:

An acyclic graph, as the name suggests, is a graph that does not contain any cycles. In other words, there is no way to traverse the graph and return to the starting vertex without revisiting any other vertex.

7. Connected Graph:

A connected graph is a graph where there is a path between every pair of vertices. In simpler terms, it means that we can reach any node from any other node by following the edges of the graph.

8. Disconnected Graph:

A disconnected graph is a graph that contains two or more connected components. These connected components are subgraphs in which all nodes are reachable from at least one node within the subgraph but not from nodes outside the subgraph.


Understanding different types of graphs in data structures is crucial for solving various problems efficiently. Whether it’s analyzing relationships, optimizing routes, or modeling complex systems, choosing the right type of graph can significantly impact the performance and accuracy of your solution. By incorporating these concepts into your programming toolkit, you’ll be well-equipped to tackle a wide range of data structure challenges.

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