What defines a hotfix?

A hotfix is specifically defined as an emergency update that addresses a particular security vulnerability or critical issue in software. This type of update is often released unexpectedly and is designed to resolve problems that need immediate attention, which may otherwise leave systems exposed to risks or malfunctions.

The key characteristic of a hotfix is its urgency and targeted nature, as it applies to specific bugs or vulnerabilities rather than general performance improvements or broad system revisions. Unlike a scheduled update, which may be planned for enhancing performance or adding features, a hotfix is deployed in response to a pressing issue, making it critical for maintaining system integrity and security.

In contrast, other options describe different categories of updates that are routine or planned, thus emphasizing the unique and immediate role that a hotfix plays in maintaining the operational health of software applications and systems.