"CRO" can refer to several things. In digital marketing

Conversion Rate Optimization, which is the process of increasing the percentage of website visitors who complete a desired action. In the context of business, a CRO can also be a Chief Revenue Officer, an executive responsible for all revenue generation processes. Additionally, in Ireland, CRO is the Companies Registration Office, which handles company registration and related filings. Finally, in healthcare, CRO can refer to Contract Research Organization, which provides services for clinical trials.