http://allpsych.com/researchmethods/correlation.html
A scatterplot consists of multiple dots that illustrate an individual observation which will be accompanied by a trend line. The trend line will be formed through the middle of the dots to illustrate whether the points on the scatterplot represent a positive, negative, strong or weak relationship. In the scatterplot above both of the variables are increasing, so the thrend line is showing a positive relationship between income and years of experience. The scatterplot above is showing that there is a direct positive correlation between how much income a person earns and how many years of experience they actually have. The more experience you have, the more money you will make is what the scatterplot shows.
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