Final answer:
The '.pro' domain is used to identify certified professionals such as doctors, lawyers, and accountants, indicating that they meet specific accreditation and professionalism standards.
Step-by-step explanation:
The .pro domain identifies certified professionals such as doctors, lawyers, and accountants. This specialized domain extension is designed to signify a level of accreditation and professionality, ensuring that individuals who operate under the .pro domain are recognized professionals in their field. Just as other domain suffixes like .edu, .gov, and .org indicate affiliation with educational institutions, the federal government, and nonprofit organizations respectively, the .pro domain is reserved for professionals who meet certain eligibility criteria.