A chapter worth reading on InformIT, excerpted from C++ Primer 5th Edition:

Working with Dynamic Memory in C++

by Stan Lippman, Josée Lajoie, Barbara Moo

C++ lets you allocate objects dynamically. The authors of C++ Primer discuss why properly freeing dynamic memory is a rich source of bugs, and how the new library defines smart pointers -- shared_ptr, unique_ptr, and weak_ptr -- that make managing dynamic memory much safer.