What information is stored in the stack data structure and how is it organized?

A stack is a data structure organized on the Last In, First Out (LIFO) principle, meaning the last added element is retrieved first.

In a stack data structure, typically stored are:

• Data elements — the actual values or objects placed in the stack.
• Top pointer — an index or reference to the last added element.

Organization:

• Elements are added (push) and removed (pop) only from the top of the stack.
• In Java, a stack can be implemented using the Stack<E> class, which extends Vector and provides methods like push, pop, peek.

Example of usage in Java:

Stack<Integer> stack = new Stack<>();
stack.push(10); // add an element
int top = stack.pop(); // retrieve an element

Thus, the stack stores an ordered set of elements with quick access only to the top.