What does the term synergism mean in relation to drugs and therapeutics?

Please provide source must be a peer-reviewed article from a scientific journal. It does not need to be a primary research article (i.e., a review article will fulfill this requirement).- you will need to justify why you believe these sources are credible. Answer the following questions to learn more about phage therapy. Broadly, what is the goal of phage therapy?  What are lytic phages? Why are lytic phages (as opposed to other types of phages) required for phage therapy? Phage therapy is not likely to be a replacement for antibiotics, but there are indications that the two therapies can be used synergistically to combat MDR infections. What does the term synergism mean in relation to drugs and therapeutics?