A trustee is a person or organization appointed to manage assets or property on behalf of another party, known as the beneficiary. Their primary responsibility is to act in the best interest of the beneficiary, ensuring that the assets are handled according to the terms of a trust agreement or legal requirements. Trustees can be involved in various contexts, such as managing a trust fund, overseeing a charitable organization, or administering an estate after someone's death. They must adhere to fiduciary duties, which means they are legally obligated to act with loyalty, care, and transparency in their decision-making processes.