Meaning of the word "on the house" in English

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

on the house

US /ɒn ðə haʊs/
UK /ɒn ðə haʊs/

Idiom

provided free of charge by the establishment, especially a restaurant or bar

Example:
The dessert was on the house because it was my birthday.
Don't worry about the drinks, they're on the house tonight!