All of the terms are quite similar, with just minor differences in meaning:
Someone who is actively seeking employment or who has successfully finished the hiring procedure and started working for a company.
An individual who has applied for a job but has not yet been hired is called a candidate. Candidates must go through the selection process in order to get hired.
Regardless of their status, a worker is any individual who performs labor or provides services; this includes employees, independent contractors, self-employed individuals, and temporary workers.
An official is a person who manages administrative or office duties, usually in the public sector or institutions. A person who works for an employer under the conditions of an employment contract in exchange for compensation is known as an employee. This word encompasses all the previously mentioned categories.
The process of locating, luring, choosing, and integrating new hires to cover vacant roles in a company is known as hiring.