Meaning of the word "I'm sure" in English

What does "I'm sure" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

I'm sure

US /aɪm ʃʊr/
UK /aɪm ʃʊə/

Phrase

used to express certainty or strong belief about something

Example:
I'm sure he'll be here soon.
Are you coming to the party? Yes, I'm sure.