> For the complete documentation index, see [llms.txt](https://docs.augelab.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.augelab.com/function-blocks/block-structures.md).
# Block Structures
A function block consists of several elements:
1. Header
2. Sockets
3. Controls
4. Unique Name
## Header
Headers can be modified by double-clicking on and setting a custom name.
## Tool Tips
Tool-tips are shown when blocks are hovered on with mouse and display information on inner mechanics of a block.
Same rules also apply to Controls. Hovering over [Controls](#Controls) may show additional information:
## Controls
Controls are custom buttons, lists, or any kind of interactable objects that are shown inside a function block. These widgets can alter the functionality of each function block.
Two same blocks with different widget configurations
## Inputs Sockets
Data is sent to blocks through input sockets. There are usually multiple sockets in a single block.
Robust data transfer is guaranteed when sockets with same color or category are connected.
## Output Sockets
Results get sent away from outputs and transferred to other blocks by connecting to an input socket.