> For the complete documentation index, see [llms.txt](https://doc.sysdevmobile.com/kalipso5/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.sysdevmobile.com/kalipso5/developing/form/expressions/functions.md).

# Functions

Functions are "self contained" modules of code that accomplish a specific task. Functions usually "take in" data, the input parameters, process it, and "return" a result.

All functions in Kalipso are available for the following operating systems:

![](/files/-MAlQBZuuTnc6hyzKSVQ)

In this group of pages you can access the list of functions and their description:

* [Functions List](/kalipso5/developing/form/expressions/functions/functions-list.md)
* [Functions Descriptions](/kalipso5/developing/form/expressions/functions/functions-descriptions.md)