Recruitment and selection
A CV (curriculum vitae) is a record of your past careers, when you apply for a job, the person who wants to hire you will ask for your CV which will tell them what you are capable of, these will also help them decide whether you are better for the job than someone else. So if you have a good CV you're more likely to get a better job or beat someone else to it.
An application form is what you will send to your employer when you're applying for a job. It is essential to fill it out as if you don't fill it out you won't get the job or someone else might get it if theirs is better. It is the best way for the employer to get information about you.
job adverts are how most places get their staff and customers. Job adverts tend to be on paper or through the internet like social networks and on TV. If you look through the newspaper you're likely to see job adverts which will most likely include a brief description of the job and sometimes the skills you need for that job and the address of the work.
Job description is basically a description of the job you are applying for. It tells you all the information about the job, like the grades needed and what you will be doing in that job and the wage you would get.
Person Specification is a description of the persons grades, skills, experience, knowledge and other skills which a candidate must posses to perform the jobs duties, usually the best specification will win the job.