Graph Neural Networks (GNNs) in PyTorch enable learning from graph-structured data, where entities are nodes connected by edges. By integrating topological information, GNNs model relationships within networks, social graphs, molecule structures, and more. Libraries like PyTorch Geometric simplify building and experimenting with various GNN architectures, such as Graph Convolutional Networks (GCNs) and Graph Attention Networks (GATs). With these tools, developers can handle tasks like node classification, link prediction, and graph-level classification. PyTorch’s flexibility and automatic differentiation support accelerate research and applications, making it easier to extract meaningful insights from interconnected data.