Different companies and development teams may have various definitions for a "hotfix." Here at Andar Software, a hotfix refers to a small portion of code that's been developed to solve a specific customer issue or a contained bug in the software for the current version of the product. Hotfixes are meant to be made quickly and be released just as fast to benefit the customers' needs.
On the other hand, a "service pack" is a large software update that includes product enhancements, as well as fixes to multiple bugs. For Andar/360, the service packs are released at the beginning of the year and mid-year.
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