I came across this sentence in Raspberry Pi's FAQs:
Is there a buy-one-give-one program?
I try to google "buy-one-give-one", but I cannot find the meaning of it. Instead, I found the following usages of "buy-one-give-one":
buy-one-give-one model
buy-one-give-one companies
buy-one-give-one glasses
buy-one-give-one shoes
buy-one-give-one gifts
What does buy-one-give-one mean?