A joint stock company is defined as an association of individuals that contributes money for a common purpose, characterized by features such as corporate personality, share capital, limited liability, and the ability to transfer shares. The document outlines its advantages, such as high capital and efficient management, as well as disadvantages like complexity and potential fraud. Additionally, it details the types of joint stock companies, formation processes, financial instruments like shares and debentures, and methods of winding up a company.