A record of all notable changes, updates, and fixes made to a software product over time.
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A changelog is the vendor's record of what changed in each product release, covering new features, improvements, bug fixes, deprecations, and security updates. For buyers, the changelog is evidence of product velocity and discipline: frequent, well-documented releases signal active maintenance, while sparse or vague entries suggest a stalled roadmap. Changelogs also support change management, letting administrators plan how upgrades affect users, integrations, and training materials. Breaking changes and deprecations announced early give teams time to adapt instead of discovering incompatibilities mid-upgrade. Security updates referenced in changelogs are part of due diligence for compliance programs, since auditors often require evidence of patch currency. Buyers should read the changelog history during evaluation to gauge whether the vendor invests in areas that matter to their organization and whether announced features actually ship.