A positive correlation is a relationship between two variables where if one variable increases, the other one also increases or if one variable decreases, the other also decreases.
It's a statistical measure that calculates the strength of the relationship between the relative movements of two variables. The values range between -1.0 and 1.0.
A scatterplot is a type of data display that shows the relationship between two numerical variables. Each member of the dataset gets plotted as a point whose x-y coordinates relates to its values for the two variables.