Resume keywords are the words that the hiring companies look for in a job application these days. These words may be some qualification, skill or some quality that is required by the hiring company. Some companies even have applicant tracking systems (ATS), it is a software that highlights the specific keywords in a job resume. So, if your resume contains those words installed in the software, it will select your application and eliminate all the others - click this link if you want to get more optimization ideas.
So, if you don’t want to be thrown out of this selection, you must add some particular keywords which are generally required by the companies.
You can see the hiring company’s job requirement and then look for specific words which can fit into your resume because the hiring manager will look for these or related words according to their requirement. For example, if you are applying for a customer care service, you should add keywords like communication skills, computer skills, customer care benefits, etc. In this way, you must focus on the job you are applying for and then think what can be the requirement of the company for this kind of job. Generally, all these details are present in the job ad.
Keywords should be scattered across your resume everywhere - view it now, what does it mean.