执照 (zhízhào) is a general term for an official license or permit issued by authorities, such as a business license (营业执照) or work permit (工作执照). 牌照 (páizhào) is more specific to business operation permits and vehicle license plates; 驾照 (jiàzhào) is the common word for a driver's license. 证书 (zhèngshū) refers to a certificate or credential (e.g., a diploma), not a permit to operate.