A resume profile or summary which are pretty synonymous is basically a section at the top of your resume after your name and contact information which just highlights the top skills you have and how they are relevant to your future employer and it is a very helpful thing if you have maybe a lot of work experience or you are making a big career transition or maybe you have had some relevant experience or specific type of technical skills that are very relevant to your future employer but they would probably be at the end of your resume. An example of such thing might be you want to do global health or international development work and you did the Peace Corps but it was five years ago and ever since then, you have been doing domestic work. So maybe you could mention that you have two years of relevant experience in any random country. All this information should be at the top of the resume to grab their attention.