Javascript is a scripting language that is primarily used in the field of web development. It is used to modify web content after it has been transferred to the client. Accordingly, the code necessary for execution (Javascript code) is transferred to the requesting party from a server together with the HTML and CSS code and other requested resources - for example, when visiting a website on a smartphone.
The browser used on it executes the Javascript code after transmission.
Javascript can thus be used to make websites more interactive or to move functions from the server to save resources - and to make the functions available offline.
The latter is security relevant, for example, when generating keys for a wallet of any crypto currency.

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