Meaning of the word "a letter of gratitude" in English

What does "a letter of gratitude" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a letter of gratitude

US /ə ˈlet̬.ɚ əv ˈɡræt̬.ə.tuːd/
UK /ə ˈlet.ər əv ˈɡræt.ɪ.tjuːd/
"a letter of gratitude" picture

Phrase

a written message expressing appreciation or thanks to someone

Example:
She sent a letter of gratitude to her mentor after graduating.
The charity received a letter of gratitude from a family they helped.