This is how I envisioned explaining Isolates to the audience.

"Dart uses Isolate model for concurrency. Isolate is nothing but a wrapper around thread. But threads, by definition, can share memory which might be easy for the developer but makes code prone to race conditions and locks. Isolates on the other hand cannot share memory and instead rely on message passing mechanism to talk with each other. If anything is difficult to comprehend, keep reading. I am sure, you’ll get it."

This is an excerpt from this article. I think this covers it basically. But anyway, thank you for your response.