Stake Holder :
Anyone that is affected by the entity in question is said to be a stakeholder in that entity.
or
Someone who is physically grasping a piece of stake in his or her hand.
Another answer: 'Stakeholder' may be interpreted literally or metaphorically.
Literally:
'Paul was a stakeholder in his aunt's business.' (Paul had invested some money in the business.)
Metaphorically:
'I'm a stakeholder in my daughter's future.' (I have invested time and effort in my daughter and I am personally interested in, and affected by, what happens in her life.)
A stakeholder is also the person who holds the bets in gambling.
A third answer In some economics theory, an entity such as a company can be imaged as a pentagon. One set of interested parties (stakeholders) are the owners, another set is the employees. A third set is the suppliers, and a fourth set is the customers. And the fifth set is the regulatory agencies. These set business practices, product performance standards, taxation regimes, etc.
Hope that helps.