Entry-level jobs that require no experience exist in many different sectors. Office support positions, such as an administrative assistant, clerical worker, data entry specialist, and secretary, are often available to entry-level job applicants. Customer service, retail, and call center jobs are likewise open to people who are new to the workforce. Many entry-level positions involve on-the-job training. Some careers in technology, financial services, or sales do not have formal training but have junior positions for new employees. A more-senior employee must supervise the junior employee’s activities until they gain experience.