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    <p>Use <a href="/questions/tagged/stack-pointer" class="post-tag" title="show questions tagged &#39;stack-pointer&#39;" rel="tag">stack-pointer</a> or <a href="/questions/tagged/callstack" class="post-tag" title="show questions tagged &#39;callstack&#39;" rel="tag">callstack</a> for questions about the <a href="https://en.wikipedia.org/wiki/Call_stack" rel="nofollow noreferrer">call-stack</a>.</p> <p>Use this tag only for questions about other stacks, used for your own data.</p> <hr> <p>A <a href="http://en.wikipedia.org/wiki/Stack_%28data_structure%29" rel="nofollow noreferrer">stack</a> is a data structure, often used as an abstract data type (ADT) in many programming languages, to store data in a last in, first out (LIFO) manner. You could imagine it like a stack of cards. If you put a card onto the top of the stack, and then take the top card off the stack, you'll get the same card you put onto it.</p> <p>Putting data onto a stack is called pushing. Taking something from a stack is called popping. Checking what's on top of a stack without removing it is called peaking.</p> <p>Here is an example program:</p> <pre><code>a = new stack() a.push(5) b = a.peak() print(b) a.push(6) b = a.pop() print(b) b = a.pop() print(b) </code></pre> <p>would give the output:</p> <pre><code>5 6 5 </code></pre> <p>The <a href="/questions/tagged/callstack" class="post-tag" title="show questions tagged &#39;callstack&#39;" rel="tag">callstack</a> is a stack data structure that's used to keep track of local variables and allows easy nested function calls (including for recursive functions). The current top-of-stack is usually tracked by a dedicated <a href="/questions/tagged/stack-pointer" class="post-tag" title="show questions tagged &#39;stack-pointer&#39;" rel="tag">stack-pointer</a> register. Different CPU architectures and calling conventions manage the stack differently, but it's common to push a return address as part of calling a function. Returning pops the return address and jumps to it, allowing a function to return to wherever it was called from.</p> <p><strong>Related tags:</strong></p> <ul> <li><a href="/questions/tagged/stack-overflow" class="post-tag" title="show questions tagged &#39;stack-overflow&#39;" rel="tag">stack-overflow</a> an error from using <code>push()</code> on a full stack</li> <li><a href="/questions/tagged/stackunderflow" class="post-tag" title="show questions tagged &#39;stackunderflow&#39;" rel="tag">stackunderflow</a> an error from using <code>pop()</code> on an empty stack</li> </ul>
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