In English, 'the' is called a definite article.

We decided to amend the company's bylaws.

In English, we use 'definite articles' when referring to specific things.

She called him by his name.

He is called the smartest in the class.

He often gets treated to dinner by his friends.

He can speak English fluently.

He called me back immediately after he hung up the phone.

Learning Modern English is important for smooth international communication.

The study of Middle English is very important for understanding the history of English.