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This is a Short video of Complete Tutorial on Concurrent Network Calls with Coroutine Kotlin
Parallel Network Calls And Return Multiple Outputs Kotlin Android Studio
A coroutine is a very efficient and complete framework to manage concurrency in a more performant and simple way.
One can think of a coroutine as a light-weight thread. Like threads, coroutines can run in parallel, wait for each other and communicate. The biggest difference is that coroutines are very cheap, almost free: we can create thousands of them, and pay very little in terms of performance. True threads, on the other hand, are expensive to start and keep around. A thousand threads can be a serious challenge for a modern machine.

Async is also used to start the coroutines, but it blocks the main thread at the entry point of the await() function in the program.
Async is basically performing a task and return a result.
async{ }, which has an await() function returns the result of the coroutine.
Use async only when you need the parallel execution network calls.
Async will block the main thread at the entry point of the await() function.
Execution of the other parts of the code will have to wait for the result of the await() function.
If you use async and do not wait for the result, it will work exactly the same as launch.
Use async when you need the results from the multiple tasks that run in parallel.
In Kotlin, a function which can accept a function as parameter or can return a function is called Higher-Order function. Instead of Integer, String or Array as a parameter to function, we will pass anonymous function or lambdas. Frequently, lambdas are passed as parameter in Kotlin functions for the convenience.

Passing lambda expression as a parameter to Higher-Order Function –
We can pass a lambda expression as a parameter to Higher-Order Function.
There are two types of lambda expression which can be passed-

Lambda expression which return Unit
Lambda expression which return any of the value integer,string etc


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