Meaning of the word "let someone know" in English

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

let someone know

US /lɛt ˈsʌmˌwʌn noʊ/
UK /lɛt ˈsʌmˌwʌn nəʊ/

Idiom

to inform someone about something

Example:
Please let me know if you can make it to the party.
I'll let you know the results as soon as I have them.