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Development team: The group of people who do the work of creating a product. Programmers, testers, designers, writers, and anyone else who has a hands-on role in product development is a member of the development team.
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Product owner: The person responsible for bridging the gap between the customer, business stakeholders, and the development team. The product owner is an expert on the product and the customer's needs and priorities. The product owner works with the development team daily to help clarify requirements.
The product owner is sometimes called a customer representative.
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Scrum master: The person responsible for supporting the development team, clearing organizational roadblocks, and keeping the agile process consistent.
A scrum master is sometimes called a project facilitator.
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Stakeholders: Anyone with an interest in the project. Stakeholders are not ultimately responsible for the product, but they provide input and are affected by the project’s outcome. The group of stakeholders is diverse and can include people from different departments, or even different companies.
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Agile mentor: Someone who has experience implementing agile projects and can share that experience with a project team. The agile mentor can provide valuable feedback and advice to new project teams and to project teams that want to perform at a higher level.