Malloc is a function in the C programming language used for dynamic memory allocation. It allows programmers to request a specific amount of memory during the execution of a program, which can be useful when the size of data is not known at compile time. The memory allocated by Malloc is taken from the heap, a region of memory used for dynamic storage. When memory is no longer needed, it is important to free it using the free function to prevent memory leaks. Malloc returns a pointer to the allocated memory, and if the allocation fails, it returns a null pointer, indicating that there is not enough memory available.