Identity lifecycle management is the process of managing a user's digital identity and access from the day they join an organization to the day they leave. It covers account creation, role changes, permission updates, and deprovisioning, and it applies to employees, contractors, service accounts, and increasingly, AI agents. Get it wrong, and you end up with two failure modes: new hires waiting days for access, and former employees who still have it. Both cost money. Only one of them makes headlines.