What is the difference between process.nextTick() and setImmediate() ?

The difference between process.nextTick() and setImmediate() is that process.nextTick() defers the execution of an action until the next pass around the event loop
or it simply calls the callback function once the ongoing execution of the event loop is finished whereas setImmediate() executes a callback on the next cycle of the event loop
and it gives back to the event loop for executing any I/O operations.