Business.
"The new startup is taking over the local biz scene with its innovative app."
In plain English: Biz is short for business, referring to any company or job where people make money by selling things or providing services.
"The local biz is really booming this summer."
Usage: Use "biz" as an informal shortening of business to refer to commercial activity or a specific job. It is best suited for casual conversation and should not be used in formal writing or professional reports.
The word biz is a clipping derived from the word business. It entered common usage as a shortened form to refer to commercial activity or work.