Hey, hope I can help,
Data is the information that you have accumulated from your experiment.
For example, in a mold experimentation on bread, some data might be that mold grew on the bread after 7 days. Data is your recorded measurements or the information that you have gathered.
The conclusion on the other hand, is when you put your data together to come up with a solution as to why the phenomenon occurred. In your conclusion, you will try to explain what happened and WHY.