What Is Outdegree in Data Structure?


Scott Campbell

In data structure, the term “outdegree” refers to the number of outgoing edges from a vertex in a graph. It is an important concept in graph theory and is used to analyze and understand the connectivity of vertices within a graph.

Understanding Outdegree

When we represent a graph using an adjacency list or an adjacency matrix, each vertex is connected to other vertices through edges. The outdegree of a vertex is simply the count of outgoing edges from that vertex.

Consider a simple example of a directed graph:

  / \
 B   C
 |   |
 D   E

In this example, the outdegree of vertex A is 2 because it has two outgoing edges, one connecting it to vertex B and another connecting it to vertex C. Similarly, vertices B, C, D, and E have outdegrees 1, 0, 0, and 0 respectively.

Applications of Outdegree

The concept of outdegree is widely used in various applications involving graphs. Some of these applications include:

  • Web Page Ranking: In web page ranking algorithms like Google’s PageRank, the outdegree of a web page is considered as an important factor in determining its relevance and importance. Pages with higher outdegrees are often considered more influential.
  • Social Network Analysis: Outdegree plays a vital role in social network analysis where individuals are represented as nodes in a graph. Analyzing the outdegrees helps identify popular individuals who have many connections.
  • Routing Algorithms: In routing algorithms for networks or transportation systems, knowledge about outdegrees helps determine potential routes with better traffic flow by avoiding congested nodes.


Outdegree is a fundamental concept in data structures and graph theory. It provides valuable insights into the connectivity and importance of vertices within a graph. Understanding outdegree is crucial in various applications such as web page ranking, social network analysis, and routing algorithms.

By considering the number of outgoing edges from a vertex, we can gain a better understanding of the relationships and patterns present within complex networks.

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