What Are Different Types of Graphs in Data Structure?


Larry Thompson

In the world of data structures, graphs play a vital role in representing complex relationships between entities. A graph is a non-linear data structure that consists of vertices or nodes connected by edges. These connections can be used to model various real-life scenarios and help in solving complex problems efficiently.

Types of Graphs

Graphs can be classified into different types based on their characteristics and properties. Let’s explore some of the commonly used types:

1. Undirected Graphs

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

In other words, the edges do not have an associated arrow indicating any particular order or flow between nodes. Each edge in an undirected graph connects two nodes without any distinction.

2. Directed Graphs

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

The direction indicates the flow or order between two connected nodes. The edges in a directed graph are represented by arrows pointing from one node to another.

3. Weighted Graphs

In weighted graphs, each edge is assigned a numerical value called weight or cost.

These weights represent some meaningful information associated with the connection between two nodes. Weighted graphs are commonly used to model scenarios where certain connections have different costs or importance.

4. Cyclic Graphs

A cyclic graph is one that contains at least one cycle, which is a path that starts and ends at the same node without passing through any other node more than once. Cyclic graphs can lead to infinite loops or repetitive paths if not handled carefully while traversing or manipulating them.

5. Acyclic Graphs

In contrast to cyclic graphs, acyclic graphs do not contain any cycles.

This means that it is not possible to traverse from a node and return to the same node without passing through any other node more than once. Acyclic graphs are often used in scenarios where repetitive paths are undesirable.

6. Bipartite Graphs

A bipartite graph is a special type of graph where the vertices can be divided into two distinct sets such that there are no edges between vertices within the same set. In other words, if we draw a line to separate the two sets of vertices, no edges cross that line.

7. Complete Graphs

A complete graph is a type of graph where every pair of distinct nodes is connected by an edge.

In other words, there is an edge between every possible pair of nodes in a complete graph. Complete graphs are often represented by n (n-1)/2 edges, where n represents the number of nodes or vertices.


Understanding the different types of graphs in data structures is crucial for effective problem-solving and modeling real-life scenarios. Whether it’s representing social networks, transportation systems, or computer networks, choosing the right type of graph based on the problem at hand can greatly impact efficiency and accuracy.

So next time you encounter a complex problem involving relationships or connections, consider using one of these types of graphs to analyze and solve it effectively!

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