Bivariate analysis is a way of looking at two different variables at the same time. For example, you could look at the effect of eating ice cream on mood. You might want to know if there is a relationship between eating ice cream and feeling happy. To do this, you could look at the two variables (eating ice cream and feeling happy) together in a bivariate analysis. In a bivariate analysis, you would look at how the two variables are related. You might find that people who eat ice cream tend to feel happier, or you might find that they don't have any relationship at all.