In graph theory, we say that an edge $e$ is a cut edge if its removal causes the original graph to become disconnected.
If $G$ is a simple graph, then it can be shown that an edge $e$ is contained in a cycle if and only if $e$ is not a cut edge (or bridge). A full proof is provided here. Thus, we usually call edges that are not part of a cycle a cut edge or a bridge.
In graph theory, we say that an edge $e$ is a cut edge if its removal causes the original graph to become disconnected.
If $G$ is a simple graph, then it can be shown that an edge $e$ is contained in a cycle if and only if $e$ is not a cut edge (or bridge). A full proof is provided here. Thus, we usually call edges that are not part of a cycle a cut edge or a bridge.