This video describes in details what are the important features of plasmids that make it a good cloning vector.
You might have several questions about plasmids in your mind like "What is the role of plasmids in bacteria?" ; "Why do we use plasmids?", "Is plasmid good for cloning?";"What is a plasmid in simple terms?" ; "What are the use of plasmid?". All of these questions would be answered in this video.