JavaScript uses heap memory for storing objects: 1) The heap is a large region of memory for dynamic allocation, 2) Objects, arrays, functions, and other complex data types are stored in the heap, 3) Heap memory allocation is more flexible but slower than stack memory, 4) The heap is managed by the JavaScript engine's garbage collector, 5) Primitive values that are part of objects are also stored in the heap with their containing objects, 6) The heap's size can grow as needed during program execution, 7) Memory fragmentation can occur in the heap after many allocations and deallocations, 8) Modern JavaScript engines employ various optimization techniques to make heap operations more efficient.