This counter tracks how many times traffic has actually matched this specific ACL entry, giving per-entry evidence of whether a given authorized source is actually being used, as opposed to the device-wide aggregate hit information implied elsewhere. An admin uses a persistently zero-hit entry as a candidate for cleanup -- an authorized source subnet that's never actually sent matching traffic might represent a stale, no-longer-needed authorization worth removing to free up entry capacity. For example, an admin auditing a near-full ACL table would specifically look for entries with zero or very low hit counts as the first candidates for removal to make room for new authorizations.