Normally each company has two parts (1) Memorandum and (2) Article of Association. Some places constitution name is used in place of Association.
Memorandum: Actually Company or Business Memorandum is where business objectives or activities clauses are written clearly. What types of business will be engaged are clearly written inside of Memorandum clauses. Said clauses might be in one sentence or multiple, depend on law of the country.
Article of Association: There are many clauses added in AoA as follows:
And some other clauses might be included as Company Act of the country.