The modal particle 的
A modal particle (语气词) is a function word that adds additional semantic meanings to the sentence or emotionally colors it. It is usually placed at the end of a sentence.
When placed at the end of a sentence, the modal particle 的 
is used to express an affirmation which strengthens the confirmation of a fact.
In English, it may be expressed with words like "certainly" or "definitely".
is used to express an affirmation which strengthens the confirmation of a fact.
In English, it may be expressed with words like "certainly" or "definitely".
Pay attention
It is often used in a sentence with the modal verb 会 .
.Examples
我们一定会成功的
We will definitely succeed
wǒmen yídìng huì chénggōng de
明天他会来的
He will definitely come tomorrow
míngtiān tā huì lái de