Вставьте артикли: Who invented -/ the computer Are -/ the tigers stronger then -/ the lions?

Who invented computer?

 Are the tigers stronger then the lions?

There are two articles in English. A / an is indefinite article. The is definite article. Sometimes we don’t use article. It is called zero article. The meaning of indefinite article is one. We use indefinite article when noun is not known. We use definite article when noun is known.