Job Analysis: the process of collecting & analyzing information about jobs to write:
• Job Description: a document that identifies the tasks & duties performed by a job
• Job Specification: a document that identifies the qualifications required by a job
• Job Evaluation: Determine relative worth of all jobs to ensure fair and equitable pay treatment for all employees
Most organizations combine the Job Description & the Job Specification into a single document for each job
Usually simply called a "Job Description"