Keywords are specific words and phrases that send a message about your qualifications, accomplishments, and knowledge of a particular industry. Employers insert keywords in job descriptions when advertizing jobs.
These keywords need to be carefully analyzed and integrated in your résumé to ensure it reflects the employer’s stated requirements. Keywords can be used throughout your résumé; in the Summary, Core Skills, and your Cover Letter.
A good way to do this is to cut and paste the ad, then highlight the keywords relating to skills you have matching those mentioned in the ad.
If you start to get excited when doing this you just might have found a job which you will be confident applying and interviewing for.