This page is about the phrasal verb improve on
If something is improved on, it's made better than it was.
- be improved on After the website was sold to a big media company, its design was improved on.
- improve on sth The sales team is trying hard to improve on last year's sales figures.
"improve upon" has the same meaning but is more formal
The design of our packaging was improved on, so now it looks
Contributor: Matt Errey