In Chapter 4 , “Power of C: Pointers,” we discussed the importance of pointers and how pointers help developers to implement efficient code and flexible ways to access data structures and polymorphism concepts in C. In this chapter, we discuss how C developers can manage application memory during runtime efficiently in terms of allocation, deallocation, and accessing. We discuss the importance of dynamic memory management for C applications to utilize the limited memory efficiently. Specifically, we discuss important library functions such as malloc, calloc, realloc, and free to manage application memory efficiently.