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A fixed path like /user/alice only works for one person. To serve any name, you need a route that captures part of the URL as data.

Wrap a path segment in angle brackets to turn it into a variable. Flask grabs whatever the user types there and hands it to your view as a parameter. 🎯

The word inside the brackets becomes the function argument. The name in the URL and the parameter in your view function must be spelled identically.

By default a captured value is always a Python string. Visiting /user/42 gives you the text "42", not the number 42.

A single route can capture several segments. Each set of angle brackets becomes its own argument in the view function, in order.

You can blend static text with captured pieces. Only the bracketed segment is dynamic; the rest of the path stays fixed and literal.

Once captured, the variable is just normal Python. Look it up in a database, format it, or branch on it like any other value.

Every visit fills the captured variable fresh. One user hitting /user/sam and another hitting /user/lee get separate, isolated requests.

A normal capture stops at the next slash. So name in /user/<name> will not include any /, since the slash marks the end of that segment.

Pick clear names that describe the data, like <username> or <product_id>. Good names make routes self-documenting and easier to maintain.

Captured variables power friendly URLs like /greet/Maria. The view simply uses the value to build a personalized response for each visitor.

You wrote /user/<name> with def profile(name). What gets passed to name?

Angle brackets turn part of a URL into a function argument. Captured values arrive as strings, and you can grab several at once. Next: typing them. 🚀