Job description is the set of rules, duties and responsibilities designed for a particular job or task. It includes the delegation of authority and responsibilities of a particular job.
Job specification includes the skills and know how required for doing a particular job. It includes the abilities and skills of an individual for which the organisation is looking for.

Job description and job specification are two different parts of job and both are equally important. Job description basically deals with the duties , tasks and responsibilities required for taking up any job. However job specifications deals with the skills , expertise and technicalities required by an individual for taking up any job.
Hence to conclude with job description and job specification both plays an important role

Thanks Namita

Job Description defines the duties,tasks,and responsibilities of a job and the Job Specification lists the required skills, qualification, and experience required to do the job.

Job Description and Job Specification, both are well described by "Shikha"!

Where there former describes the characteristics of the JOB and the later describes the characteristics of the PERSON required to perform JOB...

Job description and job specification are the two classification of Job Analysis.Job description includes basic job-related data such as job title, job location, reporting to and of employees, job summary, nature and objectives of a job, tasks and duties to be performed, working conditions and hazards involved in it.Whereas
Job Specification includes specification like educational qualifications, specific qualities, level of experience, physical, emotional, technical and communication skills required to perform a job, responsibilities involved in a job,It also includes general health, mental health, intelligence, aptitude, memory, judgment, leadership skills, emotional ability, adaptability, flexibility, values and ethics, manners and creativity, etc.

What is the difference between job description and job specification?