There is no difference between mayonnaise and salad dressing.
Mayonnaise is a bit more problematic, as the word began to spread around from the French language, and has undergone some changes in the process. For example, the mayonnaise now found in American fast-food restaurants is usually off-white, with little or no egg yolk and a thinner texture. It's usually slathered on a hamburger-hot dog meal and rarely used to dress salads.
Salad dressing itself is a big concept that includes mayonnaise, but also Thousand Island dressing hollandaise sauce sesame seed dressing balsamic vinaigrette, anything that can be used on a salad can be considered a salad dressing. I think Sriracha could also be considered a salad dressing if we wanted it to be.
Salad Dressing Notes
Common salad dressings are very high in calories, so sometimes overconsumption, may cause fire, throat inflammation, etc. In order to solve this problem, we can use legumes instead: a variety of legumes can be, of which black beans and cashews are the highest protein and fiber content.
Scientific timing of eating salads can promote your digestion, and it is best to schedule them to be enjoyed at dinner. Proper timing of consumption is important.