1. The new and delete are operator which can be overloaded. They are only available in C++. The malloc and free are standard library functions which can be used both in C and C++.
2.The new of an object invoke the constructor function and the delete of an object invoke the destructor function. The malloc and free only assign memory space but do not invoke constructor or destructor functions.
3. The new returns pointer to corresponding object, while malloc returns void pointer.