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The user interface of an Anvil app is programmed in Python. Anvil compiles that Python into Javascript, and when someone visits your app the client-side Python code runs in their web browser.
Client-side code interacts with your user interface by manipulating the Python objects that represent components. When components raise events, they call functions in your client-side code.
![](https://i.ytimg.com/vi/t_cF3Wr1g3A/maxresdefault.jpg)