Recently read a book often mentions the client code, how to understand the meaning of the noun

Recently read a book often mentions the client code, how to understand the meaning of the noun
Recently read a book, the book is very good, often refer to the entire client code this noun.
It seems that the first person is writing the server code.
My understanding is that the entire framework core code is the server-side code, and the user directly browsing the various controller is the client code, do not know whether this understanding is correct.

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For example, the Web site, the site called the server, the browser is the client.

Yes, that's the website. client code, but my client accesses a index.php,index.php to access different controllers based on the parameters. As if the book I read meant to be written on the interface? For others to call?

index.php is the file that is placed on the server, after the server processes the explanation, returns to the browser, viewing the browser source file is to view the client code (HTML).
For example index.php write
Echo ' HELLO world ';
?>
The browser will show Hello World which is the client code.

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