The memorandum of association is the charter of a company and defines its powers. It contains clauses regarding the company's name, objectives, liability of members, capital, and association or subscription. The memorandum establishes the doctrine of ultra vires, meaning a company can only act within the powers granted to it. The articles of association contain the internal regulations of a company regarding matters like share transfers, meetings, voting, and winding up. Both documents can be altered through a special resolution process.