# Visual programming in TRIK Studio Junior
A program in the TRIK Studio Junior is represented as a sequence of the [blocks](/en/trik-studio-junior/visual-programming/blocks.md) connected by the [links](/en/trik-studio-junior/visual-programming/connection-between-blocks.md).
Each program corresponds to the [main diagram](/en/trik-studio-junior/visual-programming.md#main-diagram), which may contain other [diagrams (subprograms)](/en/trik-studio-junior/visual-programming.md#subprograms). Diagrams are packaged in projects stored on the disk.
## Main diagram
The main diagram is created when the [project is created](/en/trik-studio-junior/start.md#project-creation). About adding and removing blocks to the [scene](/en/studio/interface.md#editor-window), read the article:
{% content-ref url="/pages/-MaDT\_3h6e4aB0nq3K5u" %}
[Adding and removing blocks in TRIK Studio Junior](/en/trik-studio-junior/visual-programming/blocks-add-delete.md)
{% endcontent-ref %}
## Subprograms
The diagrams with subprograms are created automatically when you add the block "Subprogram" to the scene. In this case, the subprogram is displayed by double-clicking on the "Subprogram" block on the scene.
Read more about subprograms in the article:
{% content-ref url="/pages/-MaDUL4gQGbZYW0bO9Mr" %}
[Subprograms in TRIK Studio Junior](/en/trik-studio-junior/visual-programming/subprograms.md)
{% endcontent-ref %}
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