Node structures are fundamental components in data organization, often used in computer science and programming. A node typically contains data and links to other nodes, forming a network or hierarchy. Common examples include linked lists, trees, and graphs, where each node represents an element and its connections illustrate relationships. In a tree structure, for instance, the top node is called the root, and it branches out to child nodes. This hierarchical arrangement allows for efficient data retrieval and manipulation. Understanding node structures is essential for implementing algorithms and managing data effectively in various applications.