In the US, the document which the founders of a corporation submit to the relevant state for approval after which a certificate of incorporation is issued. These two documents form the corporation's charter which endorses its legality. Information listed in the charter includes the name of the corporation, purpose, number of authorised shares and details of directors. The rules under which the corporation's internal management operates are listed in the bylaws.

Articles of association
Definition (UK specific)

The document which lists the regulations that govern the running of a company. Articles of Association will cover things like:

main business and purposes of the company

shareholder's voting rights

directors duties

general working and management practices
They are registered with the memorandum of association when the company is formed.

Definition (UK specific)

Those details which a company, when formed, must submit to the Registrar of Companies together with its articles of association. They include company name, registered office, objectives, authorised share capital and a statement of limited liability.

Bylaws
Definition (US specific)

In the US, the rules under which a corporation's internal management operates. They include details such as election of directors, duties of officers and how share transfers can be conducted.

Шайбу! Шайбу! - мы кричали,
Хоккеист не подкачал -
Шайбу тут же получали
Те, кто громче всех кричал.

:-)