Pointers store memory addresses, allowing direct data manipulation and efficient array handling. In C/C++, the address-of operator (&) retrieves a variable's address, while the dereference operator (*) accesses the value at that address. Pointer arithmetic moves pointers by element size, enabling traversal of contiguous memory blocks. Dynamic memory allocation uses malloc, calloc, realloc, and free in C, or new and delete in C++. Proper management prevents leaks, dangling pointers, and double frees. Memory leaks occur when allocated memory isn’t released, while dangling pointers reference freed memory, leading to undefined behavior. The heap differs from the stack: the stack holds automatic variables with scoped lifetimes, whereas the heap provides flexible lifetimes but requires explicit deallocation. Alignment requirements ensure pointers reference correctly aligned addresses for performance and hardware constraints. Tools like Valgrind and AddressSanitizer detect misuse, and techniques such as smart pointers (unique_ptr, shared_ptr) automate resource management in modern C++.