When you write a program, heap variables are allocated using NEW or Malloc... stack variables are local to a procedure or function, the rest are in the Var block before your code, and are neither on the heap, nor the stack. They're global to the program, or the unit.
In some (interpreted mostly) languages they are. Like some also don't have a stack at all.
But in the most common languages, there is special storages for globals, statics, and constants, which is what the grandparent means (e.g. the DATA section).
