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.
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 product manager decides what a team should build and why, owning the product's direction, priorities and outcomes. Companies hire one when engineering capacity is growing faster than clarity about which problems deserve it.
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.
A product roadmap is a high-level plan showing where a product is heading over time. It sets out the problems to address, the outcomes sought and the rough order of major work.
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