Learn in the textbookBasics of Graph Theory
DefinitionThe loanword edge (エッジ) is the English-derived name for a graph's edge (辺), and it refers to exactly the same thing.
ExplanationWhere vertices are called nodes (ノード), the term 辺 is usually replaced by the loanword edge (エッジ) as well, and a graph is described as a set of nodes and edges. In networking, the lines or links that connect devices (nodes) are sometimes treated as edges. The edge in edge computing (エッジコンピューティング) is a different sense: the outer end of a network, close to the users and devices.
Memory hookThe English word edge means a rim or border. Link it to the border of a shape, that is, the line running from corner to corner.