NASA. (2002). Belgian Flight Engineer Frank DeWinne is pictured near a plant growth experiment in the Zvezda Service Module on the International Space Station
The conclusion explains what you learned from your research, how your data supports or does not support your hypothesis, whether your hypothesis was accepted (data supports your hypothesis) or rejected (data does not support your hypothesis), and the real world applications of your research.
Here is an example:
The data did support the research hypothesis and the research hypothesis was accepted. The tomato plants that received 30 grams of fertilizer produced the tomatoes with the highest mass with a mean of 30 kg. It is concluded that tomato plants given 30 grams of fertilizer will produce significantly more massive tomatoes when compared to plants that receive 0, 10, and 20 grams of fertilizer.