A legal obligation to act in the best interests of another party — directors owe fiduciary duties to their corporations and shareholders.
A fiduciary duty is a legal obligation to act in the best interests of another party. It's the highest standard of care recognized in law. Directors of a corporation owe fiduciary duties to the company and its shareholders: they must act in good faith, with reasonable care, and in the honest belief that what they're doing is in the company's best interest.
There are two main components of director fiduciary duty. The duty of care requires directors to make decisions thoughtfully and with adequate information — not to act recklessly or without proper due diligence. The duty of loyalty requires directors to put the company's interests above their own — no self-dealing, no taking corporate opportunities for personal gain without disclosure and approval.
Fiduciary duties matter in practice because decisions made in violation of them can expose directors to personal liability. This is why boards take certain procedural steps when making decisions that might benefit a director personally (a related-party transaction), when considering a sale of the company, or when managing conflicts of interest. Business judgment rule protection — which shields directors from liability if they acted in good faith and with adequate information — depends on following proper process.