Meaning of the word "be on the same page" in English

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

be on the same page

US /bi ɑn ðə seɪm peɪdʒ/
UK /bi ɒn ðə seɪm peɪdʒ/

Idiom

to have the same understanding or agreement about something

Example:
Before we start the project, let's make sure we're all on the same page.
I thought we were on the same page about the budget, but apparently not.