Could you please anyone explain about what is the difference between Smart Contract and Blockchain? I have a technical presentation to do regarding this topic, specially on Blockchain concept.
How soon is your presentation?
You've got a LOT of learning to do about what these two concepts mean.
This video is a pretty good introduction to the general concepts of a blockchain. It generalizes some of the Bitcoin concepts, so it isn't completely accurate, but it's a good way to get started familiarizing your self with the larger concepts:
https://www.youtube.com/watch?v=bBC-nXj3Ng4