Meaning of the word "old school" in English

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

old school

US /oʊld skuːl/
UK /əʊld skuːl/
"old school" picture

Adjective

favoring traditional styles, ideas, or methods; old-fashioned

Example:
My grandpa is very old school; he still writes letters instead of emails.
He has an old school approach to business, focusing on personal relationships.