Answer:   The memory heap is divided into three generations.
Generation 0 – Used to store short-lived objects. Frequent Garbage Collection happens in this Generation.
Generation 1 – Used for medium-lived objects.
Generation 2 – Used for long-lived objects.

Answer:   By default, when the .NET application is started and virtual address space is allocated for the process the following data structures, represented as heaps, are created:

Code Heap – storing JIT-compiled native code
Small Object Heap (SOH) – storing objects of size less than 85 kilobytes
Large Object Heap (LOH) – storing objects of size greater than 85 kilobytes
Process Heap.