What is concurrency in Dart?

In Documentation, Dart is Single Threaded but to perform two operations at a time we use future objects which work same as thread. Use Future objects (futures) to perform asynchronous operations. If Dart is single threaded then why it allows to perform asynchronous operations.

An isolate is a thread that has an event loop that continuously processes events in its own memory space .27 Eyl 2021

Because Dart language is a single threaded language. However, Flutter uses several threads to do its work.

Complete Program

Using isolates, your Dart code can perform multiple independent tasks at once, using additional processor cores if they’re available . Isolates are like threads or processes, but each isolate has its own memory and a single thread running an event loop.