# Where Do the Waiting Calls Wait? The Call Stack

Trace any recursive function by hand, and see why recursion that goes too deep runs out of room: how a program keeps every waiting call's own values and the way back to it, which a single variable or a single bookmark can't do.

![Cheat sheet: Where Do the Waiting Calls Wait? The Call Stack](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/69f6cd1b1dc345c6b6800b0976b97cb4.webp)

- Category: Data Structures
- Level: Apprentice
- Tags: Call Stack (data-structures), data structures, Recursion (data-structures), Stack Frame
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/ds-call-stack-cheat-sheet