Difference between task and function?

Function:
A function is unable to enable a task however functions can enable other functions.
A function will carry out its required duty in zero simulation time. ( The program time will not be incremented during the function routine)
Within a function, no event, delay or timing control statements are permitted
In the invocation of a function their must be at least one argument to be passed.
Functions will only return a single value and can not use either output or inout statements.


Tasks:
Tasks are capable of enabling a function as well as enabling other versions of a Task
Tasks also run with a zero simulation however they can if required be executed in a non zero simulation time.
Tasks are allowed to contain any of these statements.
A task is allowed to use zero or more arguments which are of type output, input or inout.
A Task is unable to return a value but has the facility to pass multiple values via the output and inout statements .