A technical specification is a document that explains how a feature or system will be built. It covers architecture, data, interfaces, risks and trade-offs, so engineers can agree an approach before coding.
An API (application programming interface) is a defined contract that lets one piece of software request data or actions from another. It hides internal details behind agreed operations, inputs and responses.
The definition of done is a shared checklist of conditions every piece of work must meet before a team calls it complete. It makes "finished" mean the same thing for everyone.
A statement of work (SOW) is a document that defines one engagement: the work, deliverables, timeline, roles, fees and acceptance terms. It usually sits under a broader master services agreement.
Knowledge transfer is the structured handover of system understanding, decisions and operating know-how from one person or team to another. In engineering it matters most at onboarding, vendor changes, contract endings and handovers to support teams.
A product requirements document (PRD) describes what a product or feature should do and why. It sets out goals, target users, scope, requirements and success measures before design and development.
A proof of concept (PoC) is a small, focused experiment that shows whether a technical idea or approach is feasible. It comes before a team commits to building the thing properly.
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