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A service pack is a cumulative software update that bundles bug fixes, security patches, performance enhancements, and sometimes new features into a single, large package. It's a convenient way to update an operating system or other software to a more current, stable, and secure state without needing to install numerous individual updates. Service packs supersede previous updates, and once released, they are static until the next service pack or major version update is launched.

Key functions of a service pack

Consolidation: Combines many individual "hotfixes," security updates, and other patches into one download and installation process.

Bug and security fixes: Addresses issues that have been discovered since the original software release, making the system more reliable and secure.

Performance improvements: Can include updates that enhance the speed and efficiency of the software.

New features: May introduce new features or functionality, though these are typically not as significant as those found in a major version upgrade.