Meaning of the word "I don't know" in English

What does "I don't know" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

I don't know

US /aɪ doʊnt noʊ/
UK /aɪ dəʊnt nəʊ/

Phrase

used to express that one does not have the information requested or required

Example:
Where did he go? I don't know.
What time does the movie start? I don't know, let me check.