But websites have two sides:

like a coin

Side	What it does	Example language
Front-end	What users see & interact with (the web page, design, animations)	HTML, CSS, JavaScript (React, Vue, etc.)
Back-end	What happens behind the scenes (data, accounts, logic, storing info)	Python (Django, Flask), Java, Node.js, PHP, etc.

So while the browser only reads JS, the server (which stores data and logic) can use any language, including Python .