Meaning of the word "half the world does not know how the other half lives" in English

What does "half the world does not know how the other half lives" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

half the world does not know how the other half lives

US /hæf ðə wɜrld dʌz nɑt noʊ haʊ ðə ˈʌðər hæf lɪvz/
UK /hɑːf ðə wɜːld dʌz nɒt nəʊ haʊ ðə ˈʌðə hɑːf lɪvz/
"half the world does not know how the other half lives" picture

Idiom

used to say that people from different social classes or backgrounds have very little understanding of each other's lives, especially regarding wealth and poverty

Example:
Seeing the luxury of the penthouse made me realize that half the world does not know how the other half lives.
The documentary about extreme poverty showed that half the world does not know how the other half lives.