Holding Company:A holding company is a business entity”usually a corporation or limited liability company (LLC). Typically, a holding company doesnt manufacture anything, sell any products or services, or conduct any other business operations. Rather, holding companies hold the controlling stock in other companies. Although a holding company owns the assets of other companies, it often maintains only oversight capacities. So while it may oversee the company's management decisions, it does not actively participate in running a business's day-to-day operations of these subsidiaries. A holding company is also sometimes called an "umbrella" or parent company. Holding companies are protected from losses accrued by subsidiaries”so if a subsidiary goes bankrupt, its creditors can't go after the holding company. Therefore, the form of combination that sees a group of common shareholders or directions managing the policies of several companies, without any formal central administration, is Holding company. A community of interest: A collaborative group of users who exchange information in pursuit of their shared goals, interests, missions, or business processes, and who therefore must have a shared vocabulary for the information they exchange. Trust: A trust is a three-party fiduciary relationship in which the first party, the trustor or settlor, transfers property upon the second party for the benefit of the third party, the beneficiary. Informal agreement: An informal contract is any sort of contract that you enter into without any formal legal influence. A verbal agreement or a sales contract are two examples of informal contracts. It is important that you understand this type of contract before entering into one to avoid any issues if certain promises are not kept.