Corporate law (also "company" or "corporations" law) is the study of how shareholders, directors, employees, creditors, and other stakeholders such as consumers, the community and the environment interact with one another. Corporate law is a part of a broader companies law (or law of business associations). Other types of business associations can include partnerships (in the UK governed by the Partnership Act 1890), or trusts (like a pension fund), or companies limited by guarantee (like some universities or charities). Under corporate law, corporations of all sizes have separate legal personality, with limited liability or unlimited liability for its shareholders. Shareholders control the company through a board of directors which, in turn, typically delegates control of the corporation's day to day operations to a full-time executive. Corporate law deals with firms that are incorporated or registered under the corporate or company law of a sovereign state or their subnational states. The four defining characteristics of the modern corporation are: