Meaning of the word "best selling" in English

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

best selling

US /ˈbɛstˌsɛlɪŋ/
UK /ˈbɛstˌsɛlɪŋ/

Adjective

having sold more copies than any other product of its type

Example:
Her latest novel is a best-selling book.
The company launched a new best-selling smartphone.