Most people think that plot and story are the same thing, they both make for a great movie. But people dont understand how different they are.
When you tell a story you are explaining HOW things are happening. Like when you go and break and arm or leg and everyone asks how it happened. You will tell them how it happened, you where doing a sick trick on your bike, hit a ledge and went flying. You give them all the details and all the thoughts that where running through your head, and everything sounds so cool and they just keep listening.
Plot is like the structure of the story without the plot the story could have holes in it, or it doesnt make any sense. The plot makes sure that the story makes sense and allows the reader/ viewer to follow along with what is happening and to make connections to different elements of the story.