Meaning
Software Development Kit; a collection of software tools, libraries, and documentation provided by developers for developers.
Three examples from work
Architecture selection
DevShould we call Stripe's HTTP API directly or use their official Python SDK?
LeadUse their SDK; it handles retries and typing out of the box.
Version upgrade
DevThe mobile team needs to update the iOS SDK before submitting to the App Store.
LeadMake sure you test background push notifications thoroughly.
Release announcement
POWe just published our TypeScript SDK to npm.
DevRelExcellent, I'll update the quickstart guide for external developers.
Pronounce each letter: 'S-D-K'. An SDK is a wrapper package that makes calling an underlying API simpler and type-safe.