A stakeholder is defined as a person or entity that has an interest in the success of a project. Stakeholders can be internal or external. Internal stakeholders are the people who are involved in the project, such as employees and managers. External stakeholders are the people who do not work with the company, but have an interest in its success. An internal stakeholder is someone who is involved with a company, such as employees and managers. An external stakeholder is someone outside of that company but has an interest in it's success.