A research paper is a paper containing original research. That is, if you do some work to add (or try to add) new knowledge to a field of study, and then present the details of your approach and findings in a paper, that paper can be called a research paper.
Not all academic papers contain original research; other kinds of academic papers that are not research papers are
A scientific paper is any paper on a scientific subject.
Does the research paper also mean a term paper at the end of your Masters?
I need to present a research paper. So does it mean I need to present a solution to an existing problem or does it mean a summary of various solutions already existing?
If the term paper at the end of your masters contains original research, then it's a research paper.
Depending on the policies of your department, you may or may not be required to attempt original research during your masters. In some departments, a review of existing literature may be fine. If you're not sure exactly what's required from you, you need to ask the relevant faculty or staff members in your department.